{
  "fields": [{"type":"int","id":"_id"},{"type":"numeric","id":"Anno"},{"type":"numeric","id":"Vetture tram utilizzate"}],
  "records": [
    [1,2013,407],
    [2,2014,397],
    [3,2015,421],
    [4,2016,407],
    [5,2017,406],
    [6,2018,416]
]}