{
  "fields": [{"type":"int","id":"_id"},{"type":"numeric","id":"Anno"},{"type":"numeric","id":"Estensione rete tram in Km"}],
  "records": [
    [1,2013,160.8],
    [2,2014,160.8],
    [3,2015,180.4],
    [4,2016,181.8],
    [5,2017,175.7],
    [6,2018,175.7]
]}