{
  "fields": [{"type":"int","id":"_id"},{"type":"numeric","id":"Anno"},{"type":"numeric","id":"Densita' rete filobus - Km per 100 Km2 di sup. urbanizzata"}],
  "records": [
    [1,2013,35.3],
    [2,2014,35.3],
    [3,2015,35.3],
    [4,2016,35.5],
    [5,2017,35.5],
    [6,2018,35.5]
]}