{
  "fields": [{"id":"_id","type":"int"},{"id":"年度[西暦]","type":"text"},{"id":"第１号被保険者数[人]","type":"text"},{"id":"任意加入被保険者数[人]","type":"text"},{"id":"被保険者総数[人]","type":"text"}],
  "records": [
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    [3,"2022","38216","1058","39274"],
    [4,"2023","38342","1176","39518"],
    [5,"2024","38184","1184","39368"],
    [6,"令和7年度港区行政資料集　国民年金被保険者の推移（各年度末現在）","Ver202503",null,null]
]}