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      "difference": -0.960000000000008
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    {
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      "difference": -0.09000000000000341
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    {
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      "decision_session": "2023-12-22",
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      "switch_utc": "2023-12-24T23:00:00+00:00",
      "difference": -0.2600000000000051
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    {
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      "difference": -0.5100000000000051
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    {
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      "decision_session": "2024-02-26",
      "old_volume": 7027,
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      "switch_utc": "2024-02-26T23:00:00+00:00",
      "difference": -0.8299999999999983
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    {
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      "decision_session": "2024-03-27",
      "old_volume": 1920,
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      "difference": -0.6799999999999926
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    {
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      "difference": -1.2199999999999989
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      "difference": -0.8399999999999892
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    {
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      "switch_utc": "2024-07-28T22:00:00+00:00",
      "difference": -0.8400000000000034
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    {
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      "decision_session": "2024-08-23",
      "old_volume": 7003,
      "new_volume": 12081,
      "switch_utc": "2024-08-25T22:00:00+00:00",
      "difference": -0.8500000000000085
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    {
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      "decision_session": "2024-09-25",
      "old_volume": 7653,
      "new_volume": 17516,
      "switch_utc": "2024-09-25T22:00:00+00:00",
      "difference": -0.5600000000000023
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    {
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      "decision_session": "2024-10-28",
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      "switch_utc": "2024-10-28T22:00:00+00:00",
      "difference": -0.4300000000000068
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    {
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      "decision_session": "2024-11-22",
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      "switch_utc": "2024-11-24T23:00:00+00:00",
      "difference": -0.5600000000000023
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    {
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      "decision_session": "2024-12-24",
      "old_volume": 2749,
      "new_volume": 5031,
      "switch_utc": "2024-12-24T23:00:00+00:00",
      "difference": -0.37000000000000455
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    {
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      "decision_session": "2025-01-24",
      "old_volume": 6554,
      "new_volume": 12905,
      "switch_utc": "2025-01-26T23:00:00+00:00",
      "difference": -1.0
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    {
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      "decision_session": "2025-02-21",
      "old_volume": 6323,
      "new_volume": 9276,
      "switch_utc": "2025-02-23T23:00:00+00:00",
      "difference": -0.39000000000000057
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    {
      "from_contract": "BZK25-NYMEX",
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      "decision_session": "2025-03-26",
      "old_volume": 5100,
      "new_volume": 9688,
      "switch_utc": "2025-03-26T22:00:00+00:00",
      "difference": -0.730000000000004
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    {
      "from_contract": "BZM25-NYMEX",
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      "decision_session": "2025-04-25",
      "old_volume": 6764,
      "new_volume": 13975,
      "switch_utc": "2025-04-27T22:00:00+00:00",
      "difference": -1.0700000000000074
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    {
      "from_contract": "BZN25-NYMEX",
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      "decision_session": "2025-05-26",
      "old_volume": 1927,
      "new_volume": 2451,
      "switch_utc": "2025-05-26T22:00:00+00:00",
      "difference": -0.6400000000000006
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    {
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      "decision_session": "2025-06-25",
      "old_volume": 4764,
      "new_volume": 17081,
      "switch_utc": "2025-06-25T22:00:00+00:00",
      "difference": -1.1899999999999977
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    {
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      "decision_session": "2025-07-28",
      "old_volume": 4129,
      "new_volume": 9363,
      "switch_utc": "2025-07-28T22:00:00+00:00",
      "difference": -0.7600000000000051
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    {
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      "decision_session": "2025-08-27",
      "old_volume": 1283,
      "new_volume": 5901,
      "switch_utc": "2025-08-27T22:00:00+00:00",
      "difference": -0.5999999999999943
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    {
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      "decision_session": "2025-09-25",
      "old_volume": 2588,
      "new_volume": 9745,
      "switch_utc": "2025-09-25T22:00:00+00:00",
      "difference": -0.8599999999999994
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    {
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      "decision_session": "2025-10-24",
      "old_volume": 5944,
      "new_volume": 9044,
      "switch_utc": "2025-10-26T22:00:00+00:00",
      "difference": -0.769999999999996
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    {
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      "decision_session": "2025-11-21",
      "old_volume": 9932,
      "new_volume": 10518,
      "switch_utc": "2025-11-23T23:00:00+00:00",
      "difference": -0.5899999999999963
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    {
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      "decision_session": "2025-12-26",
      "old_volume": 1779,
      "new_volume": 7277,
      "switch_utc": "2025-12-28T23:00:00+00:00",
      "difference": -0.4200000000000017
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    {
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      "decision_session": "2026-01-23",
      "old_volume": 7522,
      "new_volume": 7859,
      "switch_utc": "2026-01-25T23:00:00+00:00",
      "difference": -0.8200000000000074
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    {
      "from_contract": "BZJ26-NYMEX",
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      "decision_session": "2026-02-20",
      "old_volume": 7795,
      "new_volume": 8822,
      "switch_utc": "2026-02-22T23:00:00+00:00",
      "difference": -0.4300000000000068
    },
    {
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      "decision_session": "2026-03-26",
      "old_volume": 8001,
      "new_volume": 17032,
      "switch_utc": "2026-03-26T22:00:00+00:00",
      "difference": -5.969999999999999
    },
    {
      "from_contract": "BZM26-NYMEX",
      "to_contract": "BZN26-NYMEX",
      "decision_session": "2026-04-27",
      "old_volume": 7997,
      "new_volume": 10086,
      "switch_utc": "2026-04-27T22:00:00+00:00",
      "difference": -6.400000000000006
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    {
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      "decision_session": "2026-05-26",
      "old_volume": 7878,
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      "switch_utc": "2026-05-26T22:00:00+00:00",
      "difference": -2.989999999999995
    },
    {
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      "decision_session": "2026-06-25",
      "old_volume": 6320,
      "new_volume": 10663,
      "switch_utc": "2026-06-25T22:00:00+00:00",
      "difference": 0.3100000000000023
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    {
      "from_contract": "BZU26-NYMEX",
      "to_contract": "BZV26-NYMEX",
      "decision_session": "2026-07-27",
      "old_volume": 7770,
      "new_volume": 12834,
      "switch_utc": "2026-07-27T22:00:00+00:00",
      "difference": -2.410000000000011
    },
    {
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      "to_contract": "BZX26-NYMEX",
      "decision_session": "2026-08-21",
      "old_volume": 7175,
      "new_volume": 8700,
      "switch_utc": "2026-08-23T22:00:00+00:00",
      "difference": -1.7399999999999949
    },
    {
      "from_contract": "BZX26-NYMEX",
      "to_contract": "BZZ26-NYMEX",
      "decision_session": "2026-09-25",
      "old_volume": 9191,
      "new_volume": 29443,
      "switch_utc": "2026-09-27T22:00:00+00:00",
      "difference": -6.920000000000002
    }
  ]
}