{
  "series_id": "JTSHIL_12MO_AVG",
  "source": "derived",
  "shortName": "Hires Level (12Mo Rolling Avg)",
  "updateFrequency": "monthly",
  "unit": "millions",
  "derivation": {
    "type": "rolling_ma",
    "source": "JTSHIL",
    "window": 12,
    "description": "12-month rolling moving average of JTSHIL"
  }
}