{
  "fields": [{"type":"int","id":"_id"},{"type":"numeric","id":"Anno"},{"type":"numeric","id":"Densita' rete tram - Km per 100 Km2 di sup. urbanizzata"}],
  "records": [
    [1,2013,108.7],
    [2,2014,108.7],
    [3,2015,121.9],
    [4,2016,122.8],
    [5,2017,118.7],
    [6,2018,118.7]
]}