{
  "fields": [{"type":"int","id":"_id"},{"type":"numeric","id":"Anno"},{"type":"numeric","id":"Estensione rete filobus in Km"}],
  "records": [
    [1,2013,52.3],
    [2,2014,52.3],
    [3,2015,52.3],
    [4,2016,52.6],
    [5,2017,52.6],
    [6,2018,52.6]
]}