{
  "fields": [{"id":"_id","type":"int"},{"id":"年度","type":"numeric"},{"id":"開催回数","type":"numeric"},{"id":"参加者数","type":"numeric"}],
  "records": [
    [1,30,3,38],
    [2,1,2,27],
    [3,2,1,7],
    [4,3,2,25]
]}