{
  "fields": [{"id":"_id","type":"int"},{"id":"年度","type":"text"},{"id":"被保険者数[人]","type":"text"}],
  "records": [
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    [2,"2014","19558"],
    [3,"2015","20080"],
    [4,"2016","20836"],
    [5,"2017","21327"],
    [6,null,null],
    [7,"平成30年度港区行政資料集　後期高齢者医療制度被保険者数","Ver201803"]
]}