{
  "fields": [{"type":"int","id":"_id"},{"type":"numeric","id":"Survey year"},{"type":"numeric","id":"Very easy"},{"type":"numeric","id":"Quite easy"},{"type":"numeric","id":"Neither easy nor difficult"},{"type":"numeric","id":"Quite difficult"},{"type":"numeric","id":"Very difficult"}],
  "records": [
    [1,2010,0.13,0.24,0.39,0.19,0.05],
    [2,2014,0.11,0.23,0.4,0.2,0.06],
    [3,2017,0.16,0.25,0.4,0.15,0.03],
    [4,2022,0.17,0.28,0.31,0.17,0.07],
    [5,2023,0.11,0.22,0.36,0.23,0.09],
    [6,2024,0.1,0.18,0.38,0.27,0.07]
]}