{
  "fields": [{"id":"_id","type":"int"},{"id":"年度別","type":"text"},{"id":"加入者総数（人）","type":"numeric"},{"id":"第１号被保険者強制加入者（人）","type":"numeric"},{"id":"第１号被保険者任意加入者（人）","type":"numeric"}],
  "records": [
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    [2,"2017",48356,47704,652],
    [3,"2018",47013,46337,676],
    [4,"2019",46319,45670,649],
    [5,"2020",46216,45594,622],
    [6,"",null,null,null],
    [7," ",null,null,null],
    [8," ",null,null,null]
]}