{
  "fields": [{"type":"int","id":"_id"},{"type":"numeric","id":"Anno"},{"type":"numeric","id":"Convogli metropolitana utilizzati"}],
  "records": [
    [1,2013,160],
    [2,2014,147],
    [3,2015,157],
    [4,2016,169],
    [5,2017,177],
    [6,2018,182]
]}