{
  "series_id": "UNRATE_12M_AVG",
  "source": "derived",
  "shortName": "Unemp. Rate (12M Avg)",
  "updateFrequency": "monthly",
  "unit": "percent",
  "derivation": {
    "type": "rolling_ma",
    "source": "UNRATE",
    "window": 12,
    "description": "12-month rolling moving average of unemployment rate"
  }
}