{
  "fields": [{"id":"_id","type":"int"},{"id":"年度","type":"text"},{"id":"被保険者数[人]","type":"text"}],
  "records": [
    [1,"2017","21327"],
    [2,"2018","21933"],
    [3,"2019","22200"],
    [4,"2020","22230"],
    [5,"2021","22864"],
    [6,null,null],
    [7,"令和4年度港区行政資料集　後期高齢者医療制度被保険者数","Ver202203"]
]}