{
  "schema": "cme.ng.tick.continuous/1",
  "as_of_utc": "2026-10-26T11:12:12.193567+00:00",
  "rows": 252088877,
  "volume": 376269968,
  "first_utc": "2011-05-26T19:07:45+00:00",
  "last_utc": "2026-10-26T11:00:56.744000+00:00",
  "anchor_contract": "NGZ26-NYMEX",
  "adjustments": {
    "NGZ26-NYMEX": 0.0,
    "NGX26-NYMEX": 0.42100000000000026,
    "NGV26-NYMEX": 0.5650000000000004,
    "NGU26-NYMEX": 0.6170000000000004,
    "NGQ26-NYMEX": 0.6410000000000005,
    "NGN26-NYMEX": 0.6670000000000003,
    "NGM26-NYMEX": 0.8030000000000004,
    "NGK26-NYMEX": 0.9490000000000003,
    "NGJ26-NYMEX": 0.9330000000000003,
    "NGH26-NYMEX": 0.8600000000000003,
    "NGG26-NYMEX": -0.5229999999999997,
    "NGF26-NYMEX": -1.0459999999999998,
    "NGZ25-NYMEX": -0.8629999999999991,
    "NGX25-NYMEX": -0.16699999999999893,
    "NGV25-NYMEX": 0.1150000000000011,
    "NGU25-NYMEX": 0.22200000000000086,
    "NGQ25-NYMEX": 0.2700000000000009,
    "NGN25-NYMEX": 0.378000000000001,
    "NGM25-NYMEX": 0.765000000000001,
    "NGK25-NYMEX": 0.9080000000000013,
    "NGJ25-NYMEX": 0.9490000000000012,
    "NGH25-NYMEX": 0.8430000000000013,
    "NGG25-NYMEX": 0.37000000000000144,
    "NGF25-NYMEX": 0.04500000000000126,
    "NGZ24-NYMEX": 0.1840000000000015,
    "NGX24-NYMEX": 0.6700000000000017,
    "NGV24-NYMEX": 0.8980000000000019,
    "NGU24-NYMEX": 1.0560000000000018,
    "NGQ24-NYMEX": 1.0930000000000017,
    "NGN24-NYMEX": 1.224000000000002,
    "NGM24-NYMEX": 1.4910000000000019,
    "NGK24-NYMEX": 1.762000000000002,
    "NGJ24-NYMEX": 1.901000000000002,
    "NGH24-NYMEX": 1.9880000000000022,
    "NGG24-NYMEX": 1.6820000000000022,
    "NGF24-NYMEX": 1.5700000000000025,
    "NGZ23-NYMEX": 1.7070000000000025,
    "NGX23-NYMEX": 2.0640000000000027,
    "NGV23-NYMEX": 2.2860000000000027,
    "NGU23-NYMEX": 2.3830000000000027,
    "NGQ23-NYMEX": 2.3870000000000027,
    "NGN23-NYMEX": 2.4910000000000028,
    "NGM23-NYMEX": 2.6410000000000027,
    "NGK23-NYMEX": 2.8230000000000026,
    "NGJ23-NYMEX": 2.9470000000000027,
    "NGH23-NYMEX": 3.0290000000000026,
    "NGG23-NYMEX": 2.8530000000000024,
    "NGF23-NYMEX": 2.785000000000002,
    "NGZ22-NYMEX": 3.408000000000002,
    "NGX22-NYMEX": 3.969000000000002,
    "NGV22-NYMEX": 4.132000000000002,
    "NGU22-NYMEX": 4.098000000000002,
    "NGQ22-NYMEX": 3.961000000000001,
    "NGN22-NYMEX": 4.009000000000001,
    "NGM22-NYMEX": 4.094000000000002,
    "NGK22-NYMEX": 4.220000000000002,
    "NGJ22-NYMEX": 4.270000000000002,
    "NGH22-NYMEX": 4.214000000000002,
    "NGG22-NYMEX": 4.071000000000002,
    "NGF22-NYMEX": 3.9670000000000023,
    "NGZ21-NYMEX": 4.0340000000000025,
    "NGX21-NYMEX": 4.2230000000000025,
    "NGV21-NYMEX": 4.295000000000003,
    "NGU21-NYMEX": 4.310000000000002,
    "NGQ21-NYMEX": 4.287000000000003,
    "NGN21-NYMEX": 4.306000000000003,
    "NGM21-NYMEX": 4.3770000000000024,
    "NGK21-NYMEX": 4.460000000000003,
    "NGJ21-NYMEX": 4.504000000000003,
    "NGH21-NYMEX": 4.405000000000003,
    "NGG21-NYMEX": 4.412000000000003,
    "NGF21-NYMEX": 4.387000000000002,
    "NGZ20-NYMEX": 4.506000000000002,
    "NGX20-NYMEX": 4.742000000000002,
    "NGV20-NYMEX": 5.487000000000002,
    "NGU20-NYMEX": 5.5870000000000015,
    "NGQ20-NYMEX": 5.635000000000002,
    "NGN20-NYMEX": 5.708000000000002,
    "NGM20-NYMEX": 5.854000000000002,
    "NGK20-NYMEX": 5.980000000000002,
    "NGJ20-NYMEX": 6.045000000000003,
    "NGH20-NYMEX": 6.052000000000003,
    "NGG20-NYMEX": 6.028000000000003,
    "NGF20-NYMEX": 6.038000000000003,
    "NGZ19-NYMEX": 6.087000000000003,
    "NGX19-NYMEX": 6.230000000000004,
    "NGV19-NYMEX": 6.256000000000004,
    "NGU19-NYMEX": 6.259000000000004,
    "NGQ19-NYMEX": 6.2340000000000035,
    "NGN19-NYMEX": 6.221000000000004,
    "NGM19-NYMEX": 6.231000000000003,
    "NGK19-NYMEX": 6.276000000000003,
    "NGJ19-NYMEX": 6.291000000000004,
    "NGH19-NYMEX": 6.320000000000004,
    "NGG19-NYMEX": 6.2020000000000035,
    "NGF19-NYMEX": 6.169000000000003,
    "NGZ18-NYMEX": 6.215000000000003,
    "NGX18-NYMEX": 6.274000000000004,
    "NGV18-NYMEX": 6.270000000000003,
    "NGU18-NYMEX": 6.261000000000003,
    "NGQ18-NYMEX": 6.245000000000003,
    "NGN18-NYMEX": 6.241000000000003,
    "NGM18-NYMEX": 6.276000000000003,
    "NGK18-NYMEX": 6.3110000000000035,
    "NGJ18-NYMEX": 6.350000000000003,
    "NGH18-NYMEX": 6.371000000000003,
    "NGG18-NYMEX": 5.982000000000003,
    "NGF18-NYMEX": 5.974000000000003,
    "NGZ17-NYMEX": 6.068000000000003,
    "NGX17-NYMEX": 6.228000000000003,
    "NGV17-NYMEX": 6.296000000000003,
    "NGU17-NYMEX": 6.325000000000003,
    "NGQ17-NYMEX": 6.307000000000002,
    "NGN17-NYMEX": 6.330000000000002,
    "NGM17-NYMEX": 6.419000000000002,
    "NGK17-NYMEX": 6.515000000000002,
    "NGJ17-NYMEX": 6.593000000000002,
    "NGH17-NYMEX": 6.7120000000000015,
    "NGG17-NYMEX": 6.723000000000002,
    "NGF17-NYMEX": 6.740000000000002,
    "NGZ16-NYMEX": 6.868000000000002,
    "NGX16-NYMEX": 7.246000000000002,
    "NGV16-NYMEX": 7.305000000000002,
    "NGU16-NYMEX": 7.342000000000002,
    "NGQ16-NYMEX": 7.308000000000002,
    "NGN16-NYMEX": 7.341000000000001,
    "NGM16-NYMEX": 7.508000000000001,
    "NGK16-NYMEX": 7.631,
    "NGJ16-NYMEX": 7.706,
    "NGH16-NYMEX": 7.752000000000001,
    "NGG16-NYMEX": 7.748000000000001,
    "NGF16-NYMEX": 7.792000000000002,
    "NGZ15-NYMEX": 7.9140000000000015,
    "NGX15-NYMEX": 8.204,
    "NGV15-NYMEX": 8.289000000000001,
    "NGU15-NYMEX": 8.292000000000002,
    "NGQ15-NYMEX": 8.293000000000003,
    "NGN15-NYMEX": 8.314000000000004,
    "NGM15-NYMEX": 8.345000000000004,
    "NGK15-NYMEX": 8.385000000000005,
    "NGJ15-NYMEX": 8.401000000000005,
    "NGH15-NYMEX": 8.411000000000005,
    "NGG15-NYMEX": 8.374000000000004,
    "NGF15-NYMEX": 8.416000000000004,
    "NGZ14-NYMEX": 8.573000000000004,
    "NGX14-NYMEX": 8.647000000000004,
    "NGV14-NYMEX": 8.699000000000003,
    "NGU14-NYMEX": 8.742000000000003,
    "NGQ14-NYMEX": 8.751000000000003,
    "NGN14-NYMEX": 8.773000000000003,
    "NGM14-NYMEX": 8.775000000000004,
    "NGK14-NYMEX": 8.790000000000003,
    "NGJ14-NYMEX": 8.787000000000003,
    "NGH14-NYMEX": 8.036000000000003,
    "NGG14-NYMEX": 7.860000000000003,
    "NGF14-NYMEX": 7.913000000000003,
    "NGZ13-NYMEX": 7.959000000000003,
    "NGX13-NYMEX": 8.082000000000003,
    "NGV13-NYMEX": 8.149000000000003,
    "NGU13-NYMEX": 8.189000000000004,
    "NGQ13-NYMEX": 8.202000000000004,
    "NGN13-NYMEX": 8.229000000000003,
    "NGM13-NYMEX": 8.278000000000002,
    "NGK13-NYMEX": 8.312000000000001,
    "NGJ13-NYMEX": 8.337000000000002,
    "NGH13-NYMEX": 8.39,
    "NGG13-NYMEX": 8.405000000000001,
    "NGF13-NYMEX": 8.433000000000002,
    "NGZ12-NYMEX": 8.553,
    "NGX12-NYMEX": 8.883000000000001,
    "NGV12-NYMEX": 9.028,
    "NGU12-NYMEX": 9.052,
    "NGQ12-NYMEX": 9.036999999999999,
    "NGN12-NYMEX": 9.074,
    "NGM12-NYMEX": 9.137,
    "NGK12-NYMEX": 9.226,
    "NGJ12-NYMEX": 9.335,
    "NGH12-NYMEX": 9.474,
    "NGG12-NYMEX": 9.526,
    "NGF12-NYMEX": 9.568,
    "NGZ11-NYMEX": 9.709999999999999,
    "NGX11-NYMEX": 9.893999999999998,
    "NGV11-NYMEX": 9.959999999999999,
    "NGU11-NYMEX": 9.933,
    "NGQ11-NYMEX": 9.897,
    "NGN11-NYMEX": 9.909
  },
  "files": [
    "cme.ng.tick.continuous.2011.parquet",
    "cme.ng.tick.continuous.2012.parquet",
    "cme.ng.tick.continuous.2013.parquet",
    "cme.ng.tick.continuous.2014.parquet",
    "cme.ng.tick.continuous.2015.parquet",
    "cme.ng.tick.continuous.2016.parquet",
    "cme.ng.tick.continuous.2017.parquet",
    "cme.ng.tick.continuous.2018.parquet",
    "cme.ng.tick.continuous.2019.parquet",
    "cme.ng.tick.continuous.2020.parquet",
    "cme.ng.tick.continuous.2021.parquet",
    "cme.ng.tick.continuous.2022.parquet",
    "cme.ng.tick.continuous.2023.parquet",
    "cme.ng.tick.continuous.2024.parquet",
    "cme.ng.tick.continuous.2025.parquet",
    "cme.ng.tick.continuous.2026.parquet"
  ],
  "rolls": [
    {
      "from_contract": "NGN11-NYMEX",
      "to_contract": "NGQ11-NYMEX",
      "decision_session": "2011-06-27",
      "old_volume": 53036,
      "new_volume": 66189,
      "switch_utc": "2011-06-27T22:00:00+00:00",
      "difference": 0.012000000000000455
    },
    {
      "from_contract": "NGQ11-NYMEX",
      "to_contract": "NGU11-NYMEX",
      "decision_session": "2011-07-26",
      "old_volume": 52749,
      "new_volume": 65742,
      "switch_utc": "2011-07-26T22:00:00+00:00",
      "difference": -0.03599999999999959
    },
    {
      "from_contract": "NGU11-NYMEX",
      "to_contract": "NGV11-NYMEX",
      "decision_session": "2011-08-25",
      "old_volume": 86950,
      "new_volume": 88426,
      "switch_utc": "2011-08-25T22:00:00+00:00",
      "difference": -0.027000000000000135
    },
    {
      "from_contract": "NGV11-NYMEX",
      "to_contract": "NGX11-NYMEX",
      "decision_session": "2011-09-26",
      "old_volume": 62833,
      "new_volume": 78992,
      "switch_utc": "2011-09-26T22:00:00+00:00",
      "difference": 0.06600000000000028
    },
    {
      "from_contract": "NGX11-NYMEX",
      "to_contract": "NGZ11-NYMEX",
      "decision_session": "2011-10-26",
      "old_volume": 56882,
      "new_volume": 91142,
      "switch_utc": "2011-10-26T22:00:00+00:00",
      "difference": 0.18399999999999972
    },
    {
      "from_contract": "NGZ11-NYMEX",
      "to_contract": "NGF12-NYMEX",
      "decision_session": "2011-11-24",
      "old_volume": 2528,
      "new_volume": 6500,
      "switch_utc": "2011-11-24T23:00:00+00:00",
      "difference": 0.1419999999999999
    },
    {
      "from_contract": "NGF12-NYMEX",
      "to_contract": "NGG12-NYMEX",
      "decision_session": "2011-12-27",
      "old_volume": 40633,
      "new_volume": 59633,
      "switch_utc": "2011-12-27T23:00:00+00:00",
      "difference": 0.041999999999999815
    },
    {
      "from_contract": "NGG12-NYMEX",
      "to_contract": "NGH12-NYMEX",
      "decision_session": "2012-01-26",
      "old_volume": 76908,
      "new_volume": 220282,
      "switch_utc": "2012-01-26T23:00:00+00:00",
      "difference": 0.0519999999999996
    },
    {
      "from_contract": "NGH12-NYMEX",
      "to_contract": "NGJ12-NYMEX",
      "decision_session": "2012-02-24",
      "old_volume": 63683,
      "new_volume": 91339,
      "switch_utc": "2012-02-26T23:00:00+00:00",
      "difference": 0.1389999999999998
    },
    {
      "from_contract": "NGJ12-NYMEX",
      "to_contract": "NGK12-NYMEX",
      "decision_session": "2012-03-18",
      "old_volume": 4,
      "new_volume": 8,
      "switch_utc": "2012-03-18T22:00:00+00:00",
      "difference": 0.10899999999999999
    },
    {
      "from_contract": "NGK12-NYMEX",
      "to_contract": "NGM12-NYMEX",
      "decision_session": "2012-04-24",
      "old_volume": 62766,
      "new_volume": 77873,
      "switch_utc": "2012-04-24T22:00:00+00:00",
      "difference": 0.08900000000000019
    },
    {
      "from_contract": "NGM12-NYMEX",
      "to_contract": "NGN12-NYMEX",
      "decision_session": "2012-05-25",
      "old_volume": 78286,
      "new_volume": 104412,
      "switch_utc": "2012-05-27T22:00:00+00:00",
      "difference": 0.06300000000000017
    },
    {
      "from_contract": "NGN12-NYMEX",
      "to_contract": "NGQ12-NYMEX",
      "decision_session": "2012-06-26",
      "old_volume": 53580,
      "new_volume": 70222,
      "switch_utc": "2012-06-26T22:00:00+00:00",
      "difference": 0.037000000000000366
    },
    {
      "from_contract": "NGQ12-NYMEX",
      "to_contract": "NGU12-NYMEX",
      "decision_session": "2012-07-26",
      "old_volume": 50448,
      "new_volume": 82506,
      "switch_utc": "2012-07-26T22:00:00+00:00",
      "difference": -0.015000000000000124
    },
    {
      "from_contract": "NGU12-NYMEX",
      "to_contract": "NGV12-NYMEX",
      "decision_session": "2012-08-28",
      "old_volume": 41419,
      "new_volume": 70900,
      "switch_utc": "2012-08-28T22:00:00+00:00",
      "difference": 0.02400000000000002
    },
    {
      "from_contract": "NGV12-NYMEX",
      "to_contract": "NGX12-NYMEX",
      "decision_session": "2012-09-09",
      "old_volume": 1,
      "new_volume": 2,
      "switch_utc": "2012-09-09T22:00:00+00:00",
      "difference": 0.14500000000000002
    },
    {
      "from_contract": "NGX12-NYMEX",
      "to_contract": "NGZ12-NYMEX",
      "decision_session": "2012-10-26",
      "old_volume": 33836,
      "new_volume": 55283,
      "switch_utc": "2012-10-28T22:00:00+00:00",
      "difference": 0.33000000000000007
    },
    {
      "from_contract": "NGZ12-NYMEX",
      "to_contract": "NGF13-NYMEX",
      "decision_session": "2012-11-27",
      "old_volume": 37223,
      "new_volume": 48216,
      "switch_utc": "2012-11-27T23:00:00+00:00",
      "difference": 0.11999999999999966
    },
    {
      "from_contract": "NGF13-NYMEX",
      "to_contract": "NGG13-NYMEX",
      "decision_session": "2012-12-24",
      "old_volume": 19021,
      "new_volume": 21916,
      "switch_utc": "2012-12-24T23:00:00+00:00",
      "difference": 0.028000000000000025
    },
    {
      "from_contract": "NGG13-NYMEX",
      "to_contract": "NGH13-NYMEX",
      "decision_session": "2013-01-25",
      "old_volume": 49113,
      "new_volume": 49390,
      "switch_utc": "2013-01-27T23:00:00+00:00",
      "difference": 0.015000000000000124
    },
    {
      "from_contract": "NGH13-NYMEX",
      "to_contract": "NGJ13-NYMEX",
      "decision_session": "2013-02-25",
      "old_volume": 48872,
      "new_volume": 77728,
      "switch_utc": "2013-02-25T23:00:00+00:00",
      "difference": 0.052999999999999936
    },
    {
      "from_contract": "NGJ13-NYMEX",
      "to_contract": "NGK13-NYMEX",
      "decision_session": "2013-03-22",
      "old_volume": 53254,
      "new_volume": 53645,
      "switch_utc": "2013-03-24T22:00:00+00:00",
      "difference": 0.02499999999999991
    },
    {
      "from_contract": "NGK13-NYMEX",
      "to_contract": "NGM13-NYMEX",
      "decision_session": "2013-04-25",
      "old_volume": 51166,
      "new_volume": 100440,
      "switch_utc": "2013-04-25T22:00:00+00:00",
      "difference": 0.03399999999999981
    },
    {
      "from_contract": "NGM13-NYMEX",
      "to_contract": "NGN13-NYMEX",
      "decision_session": "2013-05-27",
      "old_volume": 3702,
      "new_volume": 7686,
      "switch_utc": "2013-05-27T22:00:00+00:00",
      "difference": 0.04900000000000038
    },
    {
      "from_contract": "NGN13-NYMEX",
      "to_contract": "NGQ13-NYMEX",
      "decision_session": "2013-06-25",
      "old_volume": 37851,
      "new_volume": 67837,
      "switch_utc": "2013-06-25T22:00:00+00:00",
      "difference": 0.027000000000000135
    },
    {
      "from_contract": "NGQ13-NYMEX",
      "to_contract": "NGU13-NYMEX",
      "decision_session": "2013-07-26",
      "old_volume": 38150,
      "new_volume": 66542,
      "switch_utc": "2013-07-28T22:00:00+00:00",
      "difference": 0.0129999999999999
    },
    {
      "from_contract": "NGU13-NYMEX",
      "to_contract": "NGV13-NYMEX",
      "decision_session": "2013-08-26",
      "old_volume": 28437,
      "new_volume": 39198,
      "switch_utc": "2013-08-26T22:00:00+00:00",
      "difference": 0.040000000000000036
    },
    {
      "from_contract": "NGV13-NYMEX",
      "to_contract": "NGX13-NYMEX",
      "decision_session": "2013-09-24",
      "old_volume": 40999,
      "new_volume": 70997,
      "switch_utc": "2013-09-24T22:00:00+00:00",
      "difference": 0.06700000000000017
    },
    {
      "from_contract": "NGX13-NYMEX",
      "to_contract": "NGZ13-NYMEX",
      "decision_session": "2013-10-29",
      "old_volume": 7755,
      "new_volume": 74606,
      "switch_utc": "2013-10-29T22:00:00+00:00",
      "difference": 0.12299999999999978
    },
    {
      "from_contract": "NGZ13-NYMEX",
      "to_contract": "NGF14-NYMEX",
      "decision_session": "2013-11-22",
      "old_volume": 46508,
      "new_volume": 54030,
      "switch_utc": "2013-11-24T23:00:00+00:00",
      "difference": 0.04600000000000026
    },
    {
      "from_contract": "NGF14-NYMEX",
      "to_contract": "NGG14-NYMEX",
      "decision_session": "2013-12-24",
      "old_volume": 22750,
      "new_volume": 25857,
      "switch_utc": "2013-12-24T23:00:00+00:00",
      "difference": 0.052999999999999936
    },
    {
      "from_contract": "NGG14-NYMEX",
      "to_contract": "NGH14-NYMEX",
      "decision_session": "2014-01-27",
      "old_volume": 121773,
      "new_volume": 164010,
      "switch_utc": "2014-01-27T23:00:00+00:00",
      "difference": -0.17600000000000016
    },
    {
      "from_contract": "NGH14-NYMEX",
      "to_contract": "NGJ14-NYMEX",
      "decision_session": "2014-02-24",
      "old_volume": 97926,
      "new_volume": 130505,
      "switch_utc": "2014-02-24T23:00:00+00:00",
      "difference": -0.7509999999999994
    },
    {
      "from_contract": "NGJ14-NYMEX",
      "to_contract": "NGK14-NYMEX",
      "decision_session": "2014-03-25",
      "old_volume": 37070,
      "new_volume": 49221,
      "switch_utc": "2014-03-25T22:00:00+00:00",
      "difference": -0.0030000000000001137
    },
    {
      "from_contract": "NGK14-NYMEX",
      "to_contract": "NGM14-NYMEX",
      "decision_session": "2014-04-25",
      "old_volume": 26680,
      "new_volume": 43513,
      "switch_utc": "2014-04-27T22:00:00+00:00",
      "difference": 0.01499999999999968
    },
    {
      "from_contract": "NGM14-NYMEX",
      "to_contract": "NGN14-NYMEX",
      "decision_session": "2014-05-23",
      "old_volume": 24010,
      "new_volume": 27111,
      "switch_utc": "2014-05-25T22:00:00+00:00",
      "difference": 0.002000000000000668
    },
    {
      "from_contract": "NGN14-NYMEX",
      "to_contract": "NGQ14-NYMEX",
      "decision_session": "2014-06-24",
      "old_volume": 33829,
      "new_volume": 49147,
      "switch_utc": "2014-06-24T22:00:00+00:00",
      "difference": 0.02200000000000024
    },
    {
      "from_contract": "NGQ14-NYMEX",
      "to_contract": "NGU14-NYMEX",
      "decision_session": "2014-07-25",
      "old_volume": 23265,
      "new_volume": 34939,
      "switch_utc": "2014-07-27T22:00:00+00:00",
      "difference": 0.008999999999999897
    },
    {
      "from_contract": "NGU14-NYMEX",
      "to_contract": "NGV14-NYMEX",
      "decision_session": "2014-08-25",
      "old_volume": 36763,
      "new_volume": 45592,
      "switch_utc": "2014-08-25T22:00:00+00:00",
      "difference": 0.042999999999999705
    },
    {
      "from_contract": "NGV14-NYMEX",
      "to_contract": "NGX14-NYMEX",
      "decision_session": "2014-09-24",
      "old_volume": 36910,
      "new_volume": 52414,
      "switch_utc": "2014-09-24T22:00:00+00:00",
      "difference": 0.052000000000000046
    },
    {
      "from_contract": "NGX14-NYMEX",
      "to_contract": "NGZ14-NYMEX",
      "decision_session": "2014-10-27",
      "old_volume": 34061,
      "new_volume": 44621,
      "switch_utc": "2014-10-27T22:00:00+00:00",
      "difference": 0.07399999999999984
    },
    {
      "from_contract": "NGZ14-NYMEX",
      "to_contract": "NGF15-NYMEX",
      "decision_session": "2014-11-21",
      "old_volume": 68559,
      "new_volume": 81604,
      "switch_utc": "2014-11-23T23:00:00+00:00",
      "difference": 0.15700000000000003
    },
    {
      "from_contract": "NGF15-NYMEX",
      "to_contract": "NGG15-NYMEX",
      "decision_session": "2014-12-24",
      "old_volume": 32400,
      "new_volume": 38883,
      "switch_utc": "2014-12-24T23:00:00+00:00",
      "difference": 0.04200000000000026
    },
    {
      "from_contract": "NGG15-NYMEX",
      "to_contract": "NGH15-NYMEX",
      "decision_session": "2015-01-27",
      "old_volume": 32384,
      "new_volume": 80232,
      "switch_utc": "2015-01-27T23:00:00+00:00",
      "difference": -0.037000000000000366
    },
    {
      "from_contract": "NGH15-NYMEX",
      "to_contract": "NGJ15-NYMEX",
      "decision_session": "2015-02-23",
      "old_volume": 40159,
      "new_volume": 69494,
      "switch_utc": "2015-02-23T23:00:00+00:00",
      "difference": 0.010000000000000231
    },
    {
      "from_contract": "NGJ15-NYMEX",
      "to_contract": "NGK15-NYMEX",
      "decision_session": "2015-03-25",
      "old_volume": 37476,
      "new_volume": 56910,
      "switch_utc": "2015-03-25T22:00:00+00:00",
      "difference": 0.016000000000000014
    },
    {
      "from_contract": "NGK15-NYMEX",
      "to_contract": "NGM15-NYMEX",
      "decision_session": "2015-04-24",
      "old_volume": 24528,
      "new_volume": 31528,
      "switch_utc": "2015-04-26T22:00:00+00:00",
      "difference": 0.040000000000000036
    },
    {
      "from_contract": "NGM15-NYMEX",
      "to_contract": "NGN15-NYMEX",
      "decision_session": "2015-05-22",
      "old_volume": 41049,
      "new_volume": 50929,
      "switch_utc": "2015-05-24T22:00:00+00:00",
      "difference": 0.03100000000000014
    },
    {
      "from_contract": "NGN15-NYMEX",
      "to_contract": "NGQ15-NYMEX",
      "decision_session": "2015-06-24",
      "old_volume": 27722,
      "new_volume": 52542,
      "switch_utc": "2015-06-24T22:00:00+00:00",
      "difference": 0.02100000000000035
    },
    {
      "from_contract": "NGQ15-NYMEX",
      "to_contract": "NGU15-NYMEX",
      "decision_session": "2015-07-24",
      "old_volume": 39070,
      "new_volume": 40737,
      "switch_utc": "2015-07-26T22:00:00+00:00",
      "difference": 0.001000000000000334
    },
    {
      "from_contract": "NGU15-NYMEX",
      "to_contract": "NGV15-NYMEX",
      "decision_session": "2015-08-24",
      "old_volume": 54333,
      "new_volume": 55353,
      "switch_utc": "2015-08-24T22:00:00+00:00",
      "difference": 0.0030000000000001137
    },
    {
      "from_contract": "NGV15-NYMEX",
      "to_contract": "NGX15-NYMEX",
      "decision_session": "2015-09-24",
      "old_volume": 47709,
      "new_volume": 78880,
      "switch_utc": "2015-09-24T22:00:00+00:00",
      "difference": 0.08499999999999996
    },
    {
      "from_contract": "NGX15-NYMEX",
      "to_contract": "NGZ15-NYMEX",
      "decision_session": "2015-10-26",
      "old_volume": 81375,
      "new_volume": 123992,
      "switch_utc": "2015-10-26T22:00:00+00:00",
      "difference": 0.29000000000000004
    },
    {
      "from_contract": "NGZ15-NYMEX",
      "to_contract": "NGF16-NYMEX",
      "decision_session": "2015-11-23",
      "old_volume": 47797,
      "new_volume": 77521,
      "switch_utc": "2015-11-23T23:00:00+00:00",
      "difference": 0.12199999999999989
    },
    {
      "from_contract": "NGF16-NYMEX",
      "to_contract": "NGG16-NYMEX",
      "decision_session": "2015-12-24",
      "old_volume": 34567,
      "new_volume": 45962,
      "switch_utc": "2015-12-24T23:00:00+00:00",
      "difference": 0.04400000000000004
    },
    {
      "from_contract": "NGG16-NYMEX",
      "to_contract": "NGH16-NYMEX",
      "decision_session": "2016-01-25",
      "old_volume": 41755,
      "new_volume": 78955,
      "switch_utc": "2016-01-25T23:00:00+00:00",
      "difference": -0.0040000000000000036
    },
    {
      "from_contract": "NGH16-NYMEX",
      "to_contract": "NGJ16-NYMEX",
      "decision_session": "2016-02-23",
      "old_volume": 33759,
      "new_volume": 64016,
      "switch_utc": "2016-02-23T23:00:00+00:00",
      "difference": 0.04600000000000004
    },
    {
      "from_contract": "NGJ16-NYMEX",
      "to_contract": "NGK16-NYMEX",
      "decision_session": "2016-03-24",
      "old_volume": 40495,
      "new_volume": 60511,
      "switch_utc": "2016-03-24T22:00:00+00:00",
      "difference": 0.07499999999999996
    },
    {
      "from_contract": "NGK16-NYMEX",
      "to_contract": "NGM16-NYMEX",
      "decision_session": "2016-04-25",
      "old_volume": 43661,
      "new_volume": 88160,
      "switch_utc": "2016-04-25T22:00:00+00:00",
      "difference": 0.12299999999999978
    },
    {
      "from_contract": "NGM16-NYMEX",
      "to_contract": "NGN16-NYMEX",
      "decision_session": "2016-05-24",
      "old_volume": 44505,
      "new_volume": 77905,
      "switch_utc": "2016-05-24T22:00:00+00:00",
      "difference": 0.16700000000000004
    },
    {
      "from_contract": "NGN16-NYMEX",
      "to_contract": "NGQ16-NYMEX",
      "decision_session": "2016-06-24",
      "old_volume": 31220,
      "new_volume": 53578,
      "switch_utc": "2016-06-26T22:00:00+00:00",
      "difference": 0.03299999999999992
    },
    {
      "from_contract": "NGQ16-NYMEX",
      "to_contract": "NGU16-NYMEX",
      "decision_session": "2016-07-22",
      "old_volume": 62314,
      "new_volume": 65956,
      "switch_utc": "2016-07-24T22:00:00+00:00",
      "difference": -0.03400000000000025
    },
    {
      "from_contract": "NGU16-NYMEX",
      "to_contract": "NGV16-NYMEX",
      "decision_session": "2016-08-24",
      "old_volume": 61170,
      "new_volume": 81935,
      "switch_utc": "2016-08-24T22:00:00+00:00",
      "difference": 0.03699999999999992
    },
    {
      "from_contract": "NGV16-NYMEX",
      "to_contract": "NGX16-NYMEX",
      "decision_session": "2016-09-26",
      "old_volume": 26043,
      "new_volume": 60155,
      "switch_utc": "2016-09-26T22:00:00+00:00",
      "difference": 0.05900000000000016
    },
    {
      "from_contract": "NGX16-NYMEX",
      "to_contract": "NGZ16-NYMEX",
      "decision_session": "2016-10-25",
      "old_volume": 59148,
      "new_volume": 157994,
      "switch_utc": "2016-10-25T22:00:00+00:00",
      "difference": 0.37799999999999967
    },
    {
      "from_contract": "NGZ16-NYMEX",
      "to_contract": "NGF17-NYMEX",
      "decision_session": "2016-11-23",
      "old_volume": 38486,
      "new_volume": 87595,
      "switch_utc": "2016-11-23T23:00:00+00:00",
      "difference": 0.12799999999999967
    },
    {
      "from_contract": "NGF17-NYMEX",
      "to_contract": "NGG17-NYMEX",
      "decision_session": "2016-12-23",
      "old_volume": 38406,
      "new_volume": 63312,
      "switch_utc": "2016-12-25T23:00:00+00:00",
      "difference": 0.017000000000000348
    },
    {
      "from_contract": "NGG17-NYMEX",
      "to_contract": "NGH17-NYMEX",
      "decision_session": "2017-01-25",
      "old_volume": 26323,
      "new_volume": 70782,
      "switch_utc": "2017-01-25T23:00:00+00:00",
      "difference": 0.01100000000000012
    },
    {
      "from_contract": "NGH17-NYMEX",
      "to_contract": "NGJ17-NYMEX",
      "decision_session": "2017-02-21",
      "old_volume": 98263,
      "new_volume": 138464,
      "switch_utc": "2017-02-21T23:00:00+00:00",
      "difference": 0.11899999999999977
    },
    {
      "from_contract": "NGJ17-NYMEX",
      "to_contract": "NGK17-NYMEX",
      "decision_session": "2017-03-27",
      "old_volume": 34842,
      "new_volume": 66549,
      "switch_utc": "2017-03-27T22:00:00+00:00",
      "difference": 0.07799999999999985
    },
    {
      "from_contract": "NGK17-NYMEX",
      "to_contract": "NGM17-NYMEX",
      "decision_session": "2017-04-24",
      "old_volume": 36916,
      "new_volume": 83728,
      "switch_utc": "2017-04-24T22:00:00+00:00",
      "difference": 0.09600000000000009
    },
    {
      "from_contract": "NGM17-NYMEX",
      "to_contract": "NGN17-NYMEX",
      "decision_session": "2017-05-24",
      "old_volume": 30198,
      "new_volume": 78121,
      "switch_utc": "2017-05-24T22:00:00+00:00",
      "difference": 0.08899999999999997
    },
    {
      "from_contract": "NGN17-NYMEX",
      "to_contract": "NGQ17-NYMEX",
      "decision_session": "2017-06-26",
      "old_volume": 44075,
      "new_volume": 82769,
      "switch_utc": "2017-06-26T22:00:00+00:00",
      "difference": 0.022999999999999687
    },
    {
      "from_contract": "NGQ17-NYMEX",
      "to_contract": "NGU17-NYMEX",
      "decision_session": "2017-07-24",
      "old_volume": 66690,
      "new_volume": 70672,
      "switch_utc": "2017-07-24T22:00:00+00:00",
      "difference": -0.018000000000000238
    },
    {
      "from_contract": "NGU17-NYMEX",
      "to_contract": "NGV17-NYMEX",
      "decision_session": "2017-08-25",
      "old_volume": 32619,
      "new_volume": 76616,
      "switch_utc": "2017-08-27T22:00:00+00:00",
      "difference": 0.028999999999999915
    },
    {
      "from_contract": "NGV17-NYMEX",
      "to_contract": "NGX17-NYMEX",
      "decision_session": "2017-09-25",
      "old_volume": 41564,
      "new_volume": 78862,
      "switch_utc": "2017-09-25T22:00:00+00:00",
      "difference": 0.06800000000000006
    },
    {
      "from_contract": "NGX17-NYMEX",
      "to_contract": "NGZ17-NYMEX",
      "decision_session": "2017-10-25",
      "old_volume": 41681,
      "new_volume": 82811,
      "switch_utc": "2017-10-25T22:00:00+00:00",
      "difference": 0.16000000000000014
    },
    {
      "from_contract": "NGZ17-NYMEX",
      "to_contract": "NGF18-NYMEX",
      "decision_session": "2017-11-22",
      "old_volume": 87854,
      "new_volume": 93736,
      "switch_utc": "2017-11-22T23:00:00+00:00",
      "difference": 0.09399999999999986
    },
    {
      "from_contract": "NGF18-NYMEX",
      "to_contract": "NGG18-NYMEX",
      "decision_session": "2017-12-22",
      "old_volume": 42004,
      "new_volume": 62808,
      "switch_utc": "2017-12-24T23:00:00+00:00",
      "difference": -0.008000000000000007
    },
    {
      "from_contract": "NGG18-NYMEX",
      "to_contract": "NGH18-NYMEX",
      "decision_session": "2018-01-24",
      "old_volume": 148793,
      "new_volume": 180744,
      "switch_utc": "2018-01-24T23:00:00+00:00",
      "difference": -0.3889999999999998
    },
    {
      "from_contract": "NGH18-NYMEX",
      "to_contract": "NGJ18-NYMEX",
      "decision_session": "2018-02-21",
      "old_volume": 63465,
      "new_volume": 74113,
      "switch_utc": "2018-02-21T23:00:00+00:00",
      "difference": 0.020999999999999908
    },
    {
      "from_contract": "NGJ18-NYMEX",
      "to_contract": "NGK18-NYMEX",
      "decision_session": "2018-03-22",
      "old_volume": 42411,
      "new_volume": 51067,
      "switch_utc": "2018-03-22T22:00:00+00:00",
      "difference": 0.0389999999999997
    },
    {
      "from_contract": "NGK18-NYMEX",
      "to_contract": "NGM18-NYMEX",
      "decision_session": "2018-04-23",
      "old_volume": 38431,
      "new_volume": 45512,
      "switch_utc": "2018-04-23T22:00:00+00:00",
      "difference": 0.0349999999999997
    },
    {
      "from_contract": "NGM18-NYMEX",
      "to_contract": "NGN18-NYMEX",
      "decision_session": "2018-05-23",
      "old_volume": 54804,
      "new_volume": 71898,
      "switch_utc": "2018-05-23T22:00:00+00:00",
      "difference": 0.03500000000000014
    },
    {
      "from_contract": "NGN18-NYMEX",
      "to_contract": "NGQ18-NYMEX",
      "decision_session": "2018-06-22",
      "old_volume": 48125,
      "new_volume": 59707,
      "switch_utc": "2018-06-24T22:00:00+00:00",
      "difference": -0.0040000000000000036
    },
    {
      "from_contract": "NGQ18-NYMEX",
      "to_contract": "NGU18-NYMEX",
      "decision_session": "2018-07-24",
      "old_volume": 27758,
      "new_volume": 42765,
      "switch_utc": "2018-07-24T22:00:00+00:00",
      "difference": -0.016000000000000014
    },
    {
      "from_contract": "NGU18-NYMEX",
      "to_contract": "NGV18-NYMEX",
      "decision_session": "2018-08-27",
      "old_volume": 37698,
      "new_volume": 66989,
      "switch_utc": "2018-08-27T22:00:00+00:00",
      "difference": -0.008999999999999897
    },
    {
      "from_contract": "NGV18-NYMEX",
      "to_contract": "NGX18-NYMEX",
      "decision_session": "2018-09-21",
      "old_volume": 53259,
      "new_volume": 80188,
      "switch_utc": "2018-09-23T22:00:00+00:00",
      "difference": -0.0040000000000000036
    },
    {
      "from_contract": "NGX18-NYMEX",
      "to_contract": "NGZ18-NYMEX",
      "decision_session": "2018-10-24",
      "old_volume": 62468,
      "new_volume": 72335,
      "switch_utc": "2018-10-24T22:00:00+00:00",
      "difference": 0.05900000000000016
    },
    {
      "from_contract": "NGZ18-NYMEX",
      "to_contract": "NGF19-NYMEX",
      "decision_session": "2018-11-23",
      "old_volume": 51245,
      "new_volume": 65340,
      "switch_utc": "2018-11-25T23:00:00+00:00",
      "difference": 0.04600000000000026
    },
    {
      "from_contract": "NGF19-NYMEX",
      "to_contract": "NGG19-NYMEX",
      "decision_session": "2018-12-21",
      "old_volume": 50492,
      "new_volume": 66730,
      "switch_utc": "2018-12-23T23:00:00+00:00",
      "difference": -0.03300000000000036
    },
    {
      "from_contract": "NGG19-NYMEX",
      "to_contract": "NGH19-NYMEX",
      "decision_session": "2019-01-24",
      "old_volume": 51171,
      "new_volume": 84688,
      "switch_utc": "2019-01-24T23:00:00+00:00",
      "difference": -0.11799999999999988
    },
    {
      "from_contract": "NGH19-NYMEX",
      "to_contract": "NGJ19-NYMEX",
      "decision_session": "2019-02-20",
      "old_volume": 46007,
      "new_volume": 47278,
      "switch_utc": "2019-02-20T23:00:00+00:00",
      "difference": 0.02900000000000036
    },
    {
      "from_contract": "NGJ19-NYMEX",
      "to_contract": "NGK19-NYMEX",
      "decision_session": "2019-03-22",
      "old_volume": 50515,
      "new_volume": 66028,
      "switch_utc": "2019-03-24T22:00:00+00:00",
      "difference": 0.015000000000000124
    },
    {
      "from_contract": "NGK19-NYMEX",
      "to_contract": "NGM19-NYMEX",
      "decision_session": "2019-04-23",
      "old_volume": 57644,
      "new_volume": 84939,
      "switch_utc": "2019-04-23T22:00:00+00:00",
      "difference": 0.04500000000000037
    },
    {
      "from_contract": "NGM19-NYMEX",
      "to_contract": "NGN19-NYMEX",
      "decision_session": "2019-05-23",
      "old_volume": 47666,
      "new_volume": 57816,
      "switch_utc": "2019-05-23T22:00:00+00:00",
      "difference": 0.009999999999999787
    },
    {
      "from_contract": "NGN19-NYMEX",
      "to_contract": "NGQ19-NYMEX",
      "decision_session": "2019-06-21",
      "old_volume": 38572,
      "new_volume": 63254,
      "switch_utc": "2019-06-23T22:00:00+00:00",
      "difference": -0.013000000000000345
    },
    {
      "from_contract": "NGQ19-NYMEX",
      "to_contract": "NGU19-NYMEX",
      "decision_session": "2019-07-23",
      "old_volume": 33366,
      "new_volume": 34592,
      "switch_utc": "2019-07-23T22:00:00+00:00",
      "difference": -0.02499999999999991
    },
    {
      "from_contract": "NGU19-NYMEX",
      "to_contract": "NGV19-NYMEX",
      "decision_session": "2019-08-23",
      "old_volume": 28234,
      "new_volume": 46202,
      "switch_utc": "2019-08-25T22:00:00+00:00",
      "difference": 0.0030000000000001137
    },
    {
      "from_contract": "NGV19-NYMEX",
      "to_contract": "NGX19-NYMEX",
      "decision_session": "2019-09-23",
      "old_volume": 41131,
      "new_volume": 59852,
      "switch_utc": "2019-09-23T22:00:00+00:00",
      "difference": 0.0259999999999998
    },
    {
      "from_contract": "NGX19-NYMEX",
      "to_contract": "NGZ19-NYMEX",
      "decision_session": "2019-10-24",
      "old_volume": 61989,
      "new_volume": 73690,
      "switch_utc": "2019-10-24T22:00:00+00:00",
      "difference": 0.14300000000000024
    },
    {
      "from_contract": "NGZ19-NYMEX",
      "to_contract": "NGF20-NYMEX",
      "decision_session": "2019-11-21",
      "old_volume": 71654,
      "new_volume": 83099,
      "switch_utc": "2019-11-21T23:00:00+00:00",
      "difference": 0.04899999999999993
    },
    {
      "from_contract": "NGF20-NYMEX",
      "to_contract": "NGG20-NYMEX",
      "decision_session": "2019-12-23",
      "old_volume": 60794,
      "new_volume": 82659,
      "switch_utc": "2019-12-23T23:00:00+00:00",
      "difference": 0.009999999999999787
    },
    {
      "from_contract": "NGG20-NYMEX",
      "to_contract": "NGH20-NYMEX",
      "decision_session": "2020-01-23",
      "old_volume": 87321,
      "new_volume": 94034,
      "switch_utc": "2020-01-23T23:00:00+00:00",
      "difference": -0.02400000000000002
    },
    {
      "from_contract": "NGH20-NYMEX",
      "to_contract": "NGJ20-NYMEX",
      "decision_session": "2020-02-21",
      "old_volume": 69710,
      "new_volume": 104582,
      "switch_utc": "2020-02-23T23:00:00+00:00",
      "difference": 0.007000000000000117
    },
    {
      "from_contract": "NGJ20-NYMEX",
      "to_contract": "NGK20-NYMEX",
      "decision_session": "2020-03-24",
      "old_volume": 41084,
      "new_volume": 70735,
      "switch_utc": "2020-03-24T22:00:00+00:00",
      "difference": 0.06500000000000017
    },
    {
      "from_contract": "NGK20-NYMEX",
      "to_contract": "NGM20-NYMEX",
      "decision_session": "2020-04-22",
      "old_volume": 95032,
      "new_volume": 98090,
      "switch_utc": "2020-04-22T22:00:00+00:00",
      "difference": 0.1260000000000001
    },
    {
      "from_contract": "NGM20-NYMEX",
      "to_contract": "NGN20-NYMEX",
      "decision_session": "2020-05-21",
      "old_volume": 62783,
      "new_volume": 85627,
      "switch_utc": "2020-05-21T22:00:00+00:00",
      "difference": 0.14600000000000013
    },
    {
      "from_contract": "NGN20-NYMEX",
      "to_contract": "NGQ20-NYMEX",
      "decision_session": "2020-06-22",
      "old_volume": 62066,
      "new_volume": 68697,
      "switch_utc": "2020-06-22T22:00:00+00:00",
      "difference": 0.07300000000000018
    },
    {
      "from_contract": "NGQ20-NYMEX",
      "to_contract": "NGU20-NYMEX",
      "decision_session": "2020-07-23",
      "old_volume": 79979,
      "new_volume": 81515,
      "switch_utc": "2020-07-23T22:00:00+00:00",
      "difference": 0.04800000000000004
    },
    {
      "from_contract": "NGU20-NYMEX",
      "to_contract": "NGV20-NYMEX",
      "decision_session": "2020-08-24",
      "old_volume": 60340,
      "new_volume": 79954,
      "switch_utc": "2020-08-24T22:00:00+00:00",
      "difference": 0.10000000000000009
    },
    {
      "from_contract": "NGV20-NYMEX",
      "to_contract": "NGX20-NYMEX",
      "decision_session": "2020-09-22",
      "old_volume": 72444,
      "new_volume": 84017,
      "switch_utc": "2020-09-22T22:00:00+00:00",
      "difference": 0.7449999999999999
    },
    {
      "from_contract": "NGX20-NYMEX",
      "to_contract": "NGZ20-NYMEX",
      "decision_session": "2020-10-23",
      "old_volume": 41736,
      "new_volume": 58635,
      "switch_utc": "2020-10-25T22:00:00+00:00",
      "difference": 0.23599999999999977
    },
    {
      "from_contract": "NGZ20-NYMEX",
      "to_contract": "NGF21-NYMEX",
      "decision_session": "2020-11-20",
      "old_volume": 45813,
      "new_volume": 51271,
      "switch_utc": "2020-11-22T23:00:00+00:00",
      "difference": 0.11900000000000022
    },
    {
      "from_contract": "NGF21-NYMEX",
      "to_contract": "NGG21-NYMEX",
      "decision_session": "2020-12-23",
      "old_volume": 62355,
      "new_volume": 64307,
      "switch_utc": "2020-12-23T23:00:00+00:00",
      "difference": -0.02499999999999991
    },
    {
      "from_contract": "NGG21-NYMEX",
      "to_contract": "NGH21-NYMEX",
      "decision_session": "2021-01-22",
      "old_volume": 35923,
      "new_volume": 59907,
      "switch_utc": "2021-01-24T23:00:00+00:00",
      "difference": 0.007000000000000117
    },
    {
      "from_contract": "NGH21-NYMEX",
      "to_contract": "NGJ21-NYMEX",
      "decision_session": "2021-02-19",
      "old_volume": 37219,
      "new_volume": 78465,
      "switch_utc": "2021-02-21T23:00:00+00:00",
      "difference": -0.09899999999999975
    },
    {
      "from_contract": "NGJ21-NYMEX",
      "to_contract": "NGK21-NYMEX",
      "decision_session": "2021-03-24",
      "old_volume": 22725,
      "new_volume": 39985,
      "switch_utc": "2021-03-24T22:00:00+00:00",
      "difference": 0.04400000000000004
    },
    {
      "from_contract": "NGK21-NYMEX",
      "to_contract": "NGM21-NYMEX",
      "decision_session": "2021-04-22",
      "old_volume": 58065,
      "new_volume": 59425,
      "switch_utc": "2021-04-22T22:00:00+00:00",
      "difference": 0.08299999999999974
    },
    {
      "from_contract": "NGM21-NYMEX",
      "to_contract": "NGN21-NYMEX",
      "decision_session": "2021-05-21",
      "old_volume": 23066,
      "new_volume": 38935,
      "switch_utc": "2021-05-23T22:00:00+00:00",
      "difference": 0.07100000000000017
    },
    {
      "from_contract": "NGN21-NYMEX",
      "to_contract": "NGQ21-NYMEX",
      "decision_session": "2021-06-23",
      "old_volume": 38649,
      "new_volume": 72366,
      "switch_utc": "2021-06-23T22:00:00+00:00",
      "difference": 0.019000000000000128
    },
    {
      "from_contract": "NGQ21-NYMEX",
      "to_contract": "NGU21-NYMEX",
      "decision_session": "2021-07-23",
      "old_volume": 37989,
      "new_volume": 58544,
      "switch_utc": "2021-07-25T22:00:00+00:00",
      "difference": -0.022999999999999687
    },
    {
      "from_contract": "NGU21-NYMEX",
      "to_contract": "NGV21-NYMEX",
      "decision_session": "2021-08-23",
      "old_volume": 42997,
      "new_volume": 50229,
      "switch_utc": "2021-08-23T22:00:00+00:00",
      "difference": 0.015000000000000124
    },
    {
      "from_contract": "NGV21-NYMEX",
      "to_contract": "NGX21-NYMEX",
      "decision_session": "2021-09-23",
      "old_volume": 52807,
      "new_volume": 76343,
      "switch_utc": "2021-09-23T22:00:00+00:00",
      "difference": 0.07200000000000006
    },
    {
      "from_contract": "NGX21-NYMEX",
      "to_contract": "NGZ21-NYMEX",
      "decision_session": "2021-10-22",
      "old_volume": 40267,
      "new_volume": 54870,
      "switch_utc": "2021-10-24T22:00:00+00:00",
      "difference": 0.18900000000000006
    },
    {
      "from_contract": "NGZ21-NYMEX",
      "to_contract": "NGF22-NYMEX",
      "decision_session": "2021-11-22",
      "old_volume": 52755,
      "new_volume": 65621,
      "switch_utc": "2021-11-22T23:00:00+00:00",
      "difference": 0.06700000000000017
    },
    {
      "from_contract": "NGF22-NYMEX",
      "to_contract": "NGG22-NYMEX",
      "decision_session": "2021-12-23",
      "old_volume": 46712,
      "new_volume": 66948,
      "switch_utc": "2021-12-23T23:00:00+00:00",
      "difference": -0.10400000000000009
    },
    {
      "from_contract": "NGG22-NYMEX",
      "to_contract": "NGH22-NYMEX",
      "decision_session": "2022-01-24",
      "old_volume": 23185,
      "new_volume": 52954,
      "switch_utc": "2022-01-24T23:00:00+00:00",
      "difference": -0.1429999999999998
    },
    {
      "from_contract": "NGH22-NYMEX",
      "to_contract": "NGJ22-NYMEX",
      "decision_session": "2022-02-18",
      "old_volume": 38075,
      "new_volume": 55168,
      "switch_utc": "2022-02-20T23:00:00+00:00",
      "difference": -0.05600000000000005
    },
    {
      "from_contract": "NGJ22-NYMEX",
      "to_contract": "NGK22-NYMEX",
      "decision_session": "2022-03-24",
      "old_volume": 46170,
      "new_volume": 57910,
      "switch_utc": "2022-03-24T22:00:00+00:00",
      "difference": 0.04999999999999982
    },
    {
      "from_contract": "NGK22-NYMEX",
      "to_contract": "NGM22-NYMEX",
      "decision_session": "2022-04-22",
      "old_volume": 47737,
      "new_volume": 56785,
      "switch_utc": "2022-04-24T22:00:00+00:00",
      "difference": 0.12600000000000033
    },
    {
      "from_contract": "NGM22-NYMEX",
      "to_contract": "NGN22-NYMEX",
      "decision_session": "2022-05-23",
      "old_volume": 34392,
      "new_volume": 48642,
      "switch_utc": "2022-05-23T22:00:00+00:00",
      "difference": 0.08500000000000085
    },
    {
      "from_contract": "NGN22-NYMEX",
      "to_contract": "NGQ22-NYMEX",
      "decision_session": "2022-06-23",
      "old_volume": 41705,
      "new_volume": 61068,
      "switch_utc": "2022-06-23T22:00:00+00:00",
      "difference": 0.04800000000000004
    },
    {
      "from_contract": "NGQ22-NYMEX",
      "to_contract": "NGU22-NYMEX",
      "decision_session": "2022-07-22",
      "old_volume": 26937,
      "new_volume": 47382,
      "switch_utc": "2022-07-24T22:00:00+00:00",
      "difference": -0.13700000000000045
    },
    {
      "from_contract": "NGU22-NYMEX",
      "to_contract": "NGV22-NYMEX",
      "decision_session": "2022-08-24",
      "old_volume": 22993,
      "new_volume": 39348,
      "switch_utc": "2022-08-24T22:00:00+00:00",
      "difference": -0.034000000000000696
    },
    {
      "from_contract": "NGV22-NYMEX",
      "to_contract": "NGX22-NYMEX",
      "decision_session": "2022-09-23",
      "old_volume": 33743,
      "new_volume": 55457,
      "switch_utc": "2022-09-25T22:00:00+00:00",
      "difference": 0.16300000000000026
    },
    {
      "from_contract": "NGX22-NYMEX",
      "to_contract": "NGZ22-NYMEX",
      "decision_session": "2022-10-24",
      "old_volume": 28399,
      "new_volume": 45759,
      "switch_utc": "2022-10-24T22:00:00+00:00",
      "difference": 0.5609999999999999
    },
    {
      "from_contract": "NGZ22-NYMEX",
      "to_contract": "NGF23-NYMEX",
      "decision_session": "2022-11-22",
      "old_volume": 36210,
      "new_volume": 58399,
      "switch_utc": "2022-11-22T23:00:00+00:00",
      "difference": 0.6230000000000002
    },
    {
      "from_contract": "NGF23-NYMEX",
      "to_contract": "NGG23-NYMEX",
      "decision_session": "2022-12-22",
      "old_volume": 37532,
      "new_volume": 47458,
      "switch_utc": "2022-12-22T23:00:00+00:00",
      "difference": -0.0680000000000005
    },
    {
      "from_contract": "NGG23-NYMEX",
      "to_contract": "NGH23-NYMEX",
      "decision_session": "2023-01-24",
      "old_volume": 29585,
      "new_volume": 77827,
      "switch_utc": "2023-01-24T23:00:00+00:00",
      "difference": -0.17600000000000016
    },
    {
      "from_contract": "NGH23-NYMEX",
      "to_contract": "NGJ23-NYMEX",
      "decision_session": "2023-02-20",
      "old_volume": 12969,
      "new_volume": 16742,
      "switch_utc": "2023-02-20T23:00:00+00:00",
      "difference": 0.08199999999999985
    },
    {
      "from_contract": "NGJ23-NYMEX",
      "to_contract": "NGK23-NYMEX",
      "decision_session": "2023-03-23",
      "old_volume": 43683,
      "new_volume": 55673,
      "switch_utc": "2023-03-23T22:00:00+00:00",
      "difference": 0.12400000000000011
    },
    {
      "from_contract": "NGK23-NYMEX",
      "to_contract": "NGM23-NYMEX",
      "decision_session": "2023-04-21",
      "old_volume": 34795,
      "new_volume": 46241,
      "switch_utc": "2023-04-23T22:00:00+00:00",
      "difference": 0.18199999999999994
    },
    {
      "from_contract": "NGM23-NYMEX",
      "to_contract": "NGN23-NYMEX",
      "decision_session": "2023-05-22",
      "old_volume": 66264,
      "new_volume": 69926,
      "switch_utc": "2023-05-22T22:00:00+00:00",
      "difference": 0.1499999999999999
    },
    {
      "from_contract": "NGN23-NYMEX",
      "to_contract": "NGQ23-NYMEX",
      "decision_session": "2023-06-23",
      "old_volume": 40507,
      "new_volume": 88734,
      "switch_utc": "2023-06-25T22:00:00+00:00",
      "difference": 0.10400000000000009
    },
    {
      "from_contract": "NGQ23-NYMEX",
      "to_contract": "NGU23-NYMEX",
      "decision_session": "2023-07-24",
      "old_volume": 21004,
      "new_volume": 62010,
      "switch_utc": "2023-07-24T22:00:00+00:00",
      "difference": 0.0040000000000000036
    },
    {
      "from_contract": "NGU23-NYMEX",
      "to_contract": "NGV23-NYMEX",
      "decision_session": "2023-08-23",
      "old_volume": 51293,
      "new_volume": 61044,
      "switch_utc": "2023-08-23T22:00:00+00:00",
      "difference": 0.09699999999999998
    },
    {
      "from_contract": "NGV23-NYMEX",
      "to_contract": "NGX23-NYMEX",
      "decision_session": "2023-09-21",
      "old_volume": 56192,
      "new_volume": 70992,
      "switch_utc": "2023-09-21T22:00:00+00:00",
      "difference": 0.22199999999999998
    },
    {
      "from_contract": "NGX23-NYMEX",
      "to_contract": "NGZ23-NYMEX",
      "decision_session": "2023-10-23",
      "old_volume": 44517,
      "new_volume": 54956,
      "switch_utc": "2023-10-23T22:00:00+00:00",
      "difference": 0.3570000000000002
    },
    {
      "from_contract": "NGZ23-NYMEX",
      "to_contract": "NGF24-NYMEX",
      "decision_session": "2023-11-21",
      "old_volume": 49531,
      "new_volume": 60908,
      "switch_utc": "2023-11-21T23:00:00+00:00",
      "difference": 0.137
    },
    {
      "from_contract": "NGF24-NYMEX",
      "to_contract": "NGG24-NYMEX",
      "decision_session": "2023-12-21",
      "old_volume": 44950,
      "new_volume": 79754,
      "switch_utc": "2023-12-21T23:00:00+00:00",
      "difference": -0.11199999999999966
    },
    {
      "from_contract": "NGG24-NYMEX",
      "to_contract": "NGH24-NYMEX",
      "decision_session": "2024-01-22",
      "old_volume": 65944,
      "new_volume": 99117,
      "switch_utc": "2024-01-22T23:00:00+00:00",
      "difference": -0.30600000000000005
    },
    {
      "from_contract": "NGH24-NYMEX",
      "to_contract": "NGJ24-NYMEX",
      "decision_session": "2024-02-21",
      "old_volume": 93025,
      "new_volume": 117974,
      "switch_utc": "2024-02-21T23:00:00+00:00",
      "difference": 0.08700000000000019
    },
    {
      "from_contract": "NGJ24-NYMEX",
      "to_contract": "NGK24-NYMEX",
      "decision_session": "2024-03-20",
      "old_volume": 49840,
      "new_volume": 58515,
      "switch_utc": "2024-03-20T22:00:00+00:00",
      "difference": 0.139
    },
    {
      "from_contract": "NGK24-NYMEX",
      "to_contract": "NGM24-NYMEX",
      "decision_session": "2024-04-22",
      "old_volume": 58247,
      "new_volume": 59314,
      "switch_utc": "2024-04-22T22:00:00+00:00",
      "difference": 0.27100000000000013
    },
    {
      "from_contract": "NGM24-NYMEX",
      "to_contract": "NGN24-NYMEX",
      "decision_session": "2024-05-23",
      "old_volume": 76363,
      "new_volume": 187473,
      "switch_utc": "2024-05-23T22:00:00+00:00",
      "difference": 0.2669999999999999
    },
    {
      "from_contract": "NGN24-NYMEX",
      "to_contract": "NGQ24-NYMEX",
      "decision_session": "2024-06-21",
      "old_volume": 47833,
      "new_volume": 62449,
      "switch_utc": "2024-06-23T22:00:00+00:00",
      "difference": 0.13100000000000023
    },
    {
      "from_contract": "NGQ24-NYMEX",
      "to_contract": "NGU24-NYMEX",
      "decision_session": "2024-07-23",
      "old_volume": 52812,
      "new_volume": 56828,
      "switch_utc": "2024-07-23T22:00:00+00:00",
      "difference": 0.03699999999999992
    },
    {
      "from_contract": "NGU24-NYMEX",
      "to_contract": "NGV24-NYMEX",
      "decision_session": "2024-08-23",
      "old_volume": 28011,
      "new_volume": 59848,
      "switch_utc": "2024-08-25T22:00:00+00:00",
      "difference": 0.15799999999999992
    },
    {
      "from_contract": "NGV24-NYMEX",
      "to_contract": "NGX24-NYMEX",
      "decision_session": "2024-09-23",
      "old_volume": 59893,
      "new_volume": 139906,
      "switch_utc": "2024-09-23T22:00:00+00:00",
      "difference": 0.2280000000000002
    },
    {
      "from_contract": "NGX24-NYMEX",
      "to_contract": "NGZ24-NYMEX",
      "decision_session": "2024-10-24",
      "old_volume": 81791,
      "new_volume": 112956,
      "switch_utc": "2024-10-24T22:00:00+00:00",
      "difference": 0.4860000000000002
    },
    {
      "from_contract": "NGZ24-NYMEX",
      "to_contract": "NGF25-NYMEX",
      "decision_session": "2024-11-21",
      "old_volume": 119580,
      "new_volume": 180272,
      "switch_utc": "2024-11-21T23:00:00+00:00",
      "difference": 0.13900000000000023
    },
    {
      "from_contract": "NGF25-NYMEX",
      "to_contract": "NGG25-NYMEX",
      "decision_session": "2024-12-23",
      "old_volume": 76484,
      "new_volume": 93247,
      "switch_utc": "2024-12-23T23:00:00+00:00",
      "difference": -0.3250000000000002
    },
    {
      "from_contract": "NGG25-NYMEX",
      "to_contract": "NGH25-NYMEX",
      "decision_session": "2025-01-23",
      "old_volume": 80113,
      "new_volume": 82730,
      "switch_utc": "2025-01-23T23:00:00+00:00",
      "difference": -0.47299999999999986
    },
    {
      "from_contract": "NGH25-NYMEX",
      "to_contract": "NGJ25-NYMEX",
      "decision_session": "2025-02-21",
      "old_volume": 94843,
      "new_volume": 129489,
      "switch_utc": "2025-02-23T23:00:00+00:00",
      "difference": -0.10599999999999987
    },
    {
      "from_contract": "NGJ25-NYMEX",
      "to_contract": "NGK25-NYMEX",
      "decision_session": "2025-03-24",
      "old_volume": 42574,
      "new_volume": 78528,
      "switch_utc": "2025-03-24T22:00:00+00:00",
      "difference": 0.040999999999999925
    },
    {
      "from_contract": "NGK25-NYMEX",
      "to_contract": "NGM25-NYMEX",
      "decision_session": "2025-04-23",
      "old_volume": 39286,
      "new_volume": 67569,
      "switch_utc": "2025-04-23T22:00:00+00:00",
      "difference": 0.14300000000000024
    },
    {
      "from_contract": "NGM25-NYMEX",
      "to_contract": "NGN25-NYMEX",
      "decision_session": "2025-05-22",
      "old_volume": 46437,
      "new_volume": 60105,
      "switch_utc": "2025-05-22T22:00:00+00:00",
      "difference": 0.387
    },
    {
      "from_contract": "NGN25-NYMEX",
      "to_contract": "NGQ25-NYMEX",
      "decision_session": "2025-06-23",
      "old_volume": 58859,
      "new_volume": 86578,
      "switch_utc": "2025-06-23T22:00:00+00:00",
      "difference": 0.1080000000000001
    },
    {
      "from_contract": "NGQ25-NYMEX",
      "to_contract": "NGU25-NYMEX",
      "decision_session": "2025-07-23",
      "old_volume": 78984,
      "new_volume": 79804,
      "switch_utc": "2025-07-23T22:00:00+00:00",
      "difference": 0.04800000000000004
    },
    {
      "from_contract": "NGU25-NYMEX",
      "to_contract": "NGV25-NYMEX",
      "decision_session": "2025-08-22",
      "old_volume": 42714,
      "new_volume": 80435,
      "switch_utc": "2025-08-24T22:00:00+00:00",
      "difference": 0.10699999999999976
    },
    {
      "from_contract": "NGV25-NYMEX",
      "to_contract": "NGX25-NYMEX",
      "decision_session": "2025-09-23",
      "old_volume": 36886,
      "new_volume": 74055,
      "switch_utc": "2025-09-23T22:00:00+00:00",
      "difference": 0.28200000000000003
    },
    {
      "from_contract": "NGX25-NYMEX",
      "to_contract": "NGZ25-NYMEX",
      "decision_session": "2025-10-24",
      "old_volume": 68680,
      "new_volume": 88571,
      "switch_utc": "2025-10-26T22:00:00+00:00",
      "difference": 0.6960000000000002
    },
    {
      "from_contract": "NGZ25-NYMEX",
      "to_contract": "NGF26-NYMEX",
      "decision_session": "2025-11-20",
      "old_volume": 63749,
      "new_volume": 90260,
      "switch_utc": "2025-11-20T23:00:00+00:00",
      "difference": 0.18300000000000072
    },
    {
      "from_contract": "NGF26-NYMEX",
      "to_contract": "NGG26-NYMEX",
      "decision_session": "2025-12-23",
      "old_volume": 80680,
      "new_volume": 115478,
      "switch_utc": "2025-12-23T23:00:00+00:00",
      "difference": -0.5230000000000001
    },
    {
      "from_contract": "NGG26-NYMEX",
      "to_contract": "NGH26-NYMEX",
      "decision_session": "2026-01-22",
      "old_volume": 210153,
      "new_volume": 212355,
      "switch_utc": "2026-01-22T23:00:00+00:00",
      "difference": -1.383
    },
    {
      "from_contract": "NGH26-NYMEX",
      "to_contract": "NGJ26-NYMEX",
      "decision_session": "2026-02-20",
      "old_volume": 54998,
      "new_volume": 79701,
      "switch_utc": "2026-02-22T23:00:00+00:00",
      "difference": -0.07299999999999995
    },
    {
      "from_contract": "NGJ26-NYMEX",
      "to_contract": "NGK26-NYMEX",
      "decision_session": "2026-03-23",
      "old_volume": 75968,
      "new_volume": 94567,
      "switch_utc": "2026-03-23T22:00:00+00:00",
      "difference": -0.016000000000000014
    },
    {
      "from_contract": "NGK26-NYMEX",
      "to_contract": "NGM26-NYMEX",
      "decision_session": "2026-04-23",
      "old_volume": 41973,
      "new_volume": 106619,
      "switch_utc": "2026-04-23T22:00:00+00:00",
      "difference": 0.1459999999999999
    },
    {
      "from_contract": "NGM26-NYMEX",
      "to_contract": "NGN26-NYMEX",
      "decision_session": "2026-05-21",
      "old_volume": 42687,
      "new_volume": 84870,
      "switch_utc": "2026-05-21T22:00:00+00:00",
      "difference": 0.13600000000000012
    },
    {
      "from_contract": "NGN26-NYMEX",
      "to_contract": "NGQ26-NYMEX",
      "decision_session": "2026-06-22",
      "old_volume": 62354,
      "new_volume": 72122,
      "switch_utc": "2026-06-22T22:00:00+00:00",
      "difference": 0.0259999999999998
    },
    {
      "from_contract": "NGQ26-NYMEX",
      "to_contract": "NGU26-NYMEX",
      "decision_session": "2026-07-24",
      "old_volume": 38688,
      "new_volume": 83649,
      "switch_utc": "2026-07-26T22:00:00+00:00",
      "difference": 0.02400000000000002
    },
    {
      "from_contract": "NGU26-NYMEX",
      "to_contract": "NGV26-NYMEX",
      "decision_session": "2026-08-24",
      "old_volume": 44089,
      "new_volume": 93260,
      "switch_utc": "2026-08-24T22:00:00+00:00",
      "difference": 0.052000000000000046
    },
    {
      "from_contract": "NGV26-NYMEX",
      "to_contract": "NGX26-NYMEX",
      "decision_session": "2026-09-22",
      "old_volume": 92543,
      "new_volume": 102998,
      "switch_utc": "2026-09-22T22:00:00+00:00",
      "difference": 0.14400000000000013
    },
    {
      "from_contract": "NGX26-NYMEX",
      "to_contract": "NGZ26-NYMEX",
      "decision_session": "2026-10-23",
      "old_volume": 80513,
      "new_volume": 114362,
      "switch_utc": "2026-10-25T22:00:00+00:00",
      "difference": 0.42100000000000026
    }
  ]
}