[
  {
    "year": 1960,
    "value": 23.7
  },
  {
    "year": 1961,
    "value": 23.3
  },
  {
    "year": 1962,
    "value": 22.4
  },
  {
    "year": 1963,
    "value": 21.7
  },
  {
    "year": 1964,
    "value": 21.1
  },
  {
    "year": 1965,
    "value": 19.4
  },
  {
    "year": 1966,
    "value": 18.4
  },
  {
    "year": 1967,
    "value": 17.8
  },
  {
    "year": 1968,
    "value": 17.6
  },
  {
    "year": 1969,
    "value": 17.9
  },
  {
    "year": 1970,
    "value": 18.4
  },
  {
    "year": 1971,
    "value": 17.2
  },
  {
    "year": 1972,
    "value": 15.6
  },
  {
    "year": 1973,
    "value": 14.8
  },
  {
    "year": 1974,
    "value": 14.8
  },
  {
    "year": 1975,
    "value": 14.6
  },
  {
    "year": 1976,
    "value": 14.6
  },
  {
    "year": 1977,
    "value": 15.1
  },
  {
    "year": 1978,
    "value": 15
  },
  {
    "year": 1979,
    "value": 15.6
  },
  {
    "year": 1980,
    "value": 15.9
  },
  {
    "year": 1981,
    "value": 15.8
  },
  {
    "year": 1982,
    "value": 15.9
  },
  {
    "year": 1983,
    "value": 15.6
  },
  {
    "year": 1984,
    "value": 15.6
  },
  {
    "year": 1985,
    "value": 15.8
  },
  {
    "year": 1986,
    "value": 15.6
  },
  {
    "year": 1987,
    "value": 15.7
  },
  {
    "year": 1988,
    "value": 16
  },
  {
    "year": 1989,
    "value": 16.4
  },
  {
    "year": 1990,
    "value": 16.7
  },
  {
    "year": 1991,
    "value": 16.2
  },
  {
    "year": 1992,
    "value": 15.8
  },
  {
    "year": 1993,
    "value": 15.4
  },
  {
    "year": 1994,
    "value": 15
  },
  {
    "year": 1995,
    "value": 14.6
  },
  {
    "year": 1996,
    "value": 14.4
  },
  {
    "year": 1997,
    "value": 14.2
  },
  {
    "year": 1998,
    "value": 14.3
  },
  {
    "year": 1999,
    "value": 14.2
  },
  {
    "year": 2000,
    "value": 14.4
  },
  {
    "year": 2001,
    "value": 14.1
  },
  {
    "year": 2002,
    "value": 14
  },
  {
    "year": 2003,
    "value": 14.1
  },
  {
    "year": 2004,
    "value": 14
  },
  {
    "year": 2005,
    "value": 14
  },
  {
    "year": 2006,
    "value": 14.3
  },
  {
    "year": 2007,
    "value": 14.3
  },
  {
    "year": 2008,
    "value": 14
  },
  {
    "year": 2009,
    "value": 13.5
  },
  {
    "year": 2010,
    "value": 13
  },
  {
    "year": 2011,
    "value": 12.7
  },
  {
    "year": 2012,
    "value": 12.6
  },
  {
    "year": 2013,
    "value": 12.4
  },
  {
    "year": 2014,
    "value": 12.5
  },
  {
    "year": 2015,
    "value": 12.4
  },
  {
    "year": 2016,
    "value": 12.2
  },
  {
    "year": 2017,
    "value": 11.8
  },
  {
    "year": 2018,
    "value": 11.6
  },
  {
    "year": 2019,
    "value": 11.4
  },
  {
    "year": 2020,
    "value": 10.9
  },
  {
    "year": 2021,
    "value": 11
  },
  {
    "year": 2022,
    "value": 11
  },
  {
    "year": 2023,
    "value": 10.7
  },
  {
    "year": 2024,
    "value": 10.6
  }
]