{
  "fields": [{"id":"_id","type":"int"},{"id":"年度","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":"numeric"},{"id":"被保険者総数[人]","type":"numeric"}],
  "records": [
    [1,"2017","39003",982,39985],
    [2,"2018","38294",979,39273],
    [3,"2019","38497",965,39462],
    [4,"2020","38043",960,39003],
    [5,"2021","37743",1024,38767],
    [6,null,null,null,null],
    [7,"令和4年度港区行政資料集　国民年金被保険者の推移","Ver202203",null,null]
]}