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      "old_volume": 846296,
      "new_volume": 972841,
      "switch_utc": "2024-11-26T23:00:00+00:00",
      "difference": 0.15625
    },
    {
      "from_contract": "ZNH25-CBOT",
      "to_contract": "ZNM25-CBOT",
      "decision_session": "2025-02-26",
      "old_volume": 811204,
      "new_volume": 1685412,
      "switch_utc": "2025-02-26T23:00:00+00:00",
      "difference": 0.046875
    },
    {
      "from_contract": "ZNM25-CBOT",
      "to_contract": "ZNU25-CBOT",
      "decision_session": "2025-05-28",
      "old_volume": 511716,
      "new_volume": 921757,
      "switch_utc": "2025-05-28T22:00:00+00:00",
      "difference": 0.03125
    },
    {
      "from_contract": "ZNU25-CBOT",
      "to_contract": "ZNZ25-CBOT",
      "decision_session": "2025-08-27",
      "old_volume": 447619,
      "new_volume": 1040964,
      "switch_utc": "2025-08-27T22:00:00+00:00",
      "difference": 0.046875
    },
    {
      "from_contract": "ZNZ25-CBOT",
      "to_contract": "ZNH26-CBOT",
      "decision_session": "2025-11-25",
      "old_volume": 751066,
      "new_volume": 1382118,
      "switch_utc": "2025-11-25T23:00:00+00:00",
      "difference": -0.0625
    },
    {
      "from_contract": "ZNH26-CBOT",
      "to_contract": "ZNM26-CBOT",
      "decision_session": "2026-02-25",
      "old_volume": 441599,
      "new_volume": 1024787,
      "switch_utc": "2026-02-25T23:00:00+00:00",
      "difference": -0.046875
    },
    {
      "from_contract": "ZNM26-CBOT",
      "to_contract": "ZNU26-CBOT",
      "decision_session": "2026-05-27",
      "old_volume": 491263,
      "new_volume": 1435339,
      "switch_utc": "2026-05-27T22:00:00+00:00",
      "difference": -0.265625
    },
    {
      "from_contract": "ZNU26-CBOT",
      "to_contract": "ZNZ26-CBOT",
      "decision_session": "2026-08-27",
      "old_volume": 343122,
      "new_volume": 1123214,
      "switch_utc": "2026-08-27T22:00:00+00:00",
      "difference": -0.234375
    }
  ]
}