[
  {
    "year": 1886,
    "value": 9.2
  },
  {
    "year": 1887,
    "value": 8.7
  },
  {
    "year": 1889,
    "value": 9.1
  },
  {
    "year": 1890,
    "value": 9
  },
  {
    "year": 1892,
    "value": 9.2
  },
  {
    "year": 1893,
    "value": 9
  },
  {
    "year": 1894,
    "value": 8.6
  },
  {
    "year": 1895,
    "value": 8.9
  },
  {
    "year": 1896,
    "value": 9
  },
  {
    "year": 1897,
    "value": 8.9
  },
  {
    "year": 1898,
    "value": 8.8
  },
  {
    "year": 1899,
    "value": 9
  },
  {
    "year": 1902,
    "value": 9.8
  },
  {
    "year": 1903,
    "value": 10.1
  },
  {
    "year": 1904,
    "value": 9.9
  },
  {
    "year": 1905,
    "value": 10
  },
  {
    "year": 1906,
    "value": 10.5
  },
  {
    "year": 1907,
    "value": 10.8
  },
  {
    "year": 1908,
    "value": 9.7
  },
  {
    "year": 1909,
    "value": 9.9
  },
  {
    "year": 1910,
    "value": 10.3
  },
  {
    "year": 1912,
    "value": 10.5
  },
  {
    "year": 1913,
    "value": 10.5
  },
  {
    "year": 1914,
    "value": 10.3
  },
  {
    "year": 1915,
    "value": 10
  },
  {
    "year": 1916,
    "value": 10.6
  },
  {
    "year": 1917,
    "value": 11.1
  },
  {
    "year": 1918,
    "value": 9.7
  },
  {
    "year": 1919,
    "value": 11
  },
  {
    "year": 1920,
    "value": 12
  },
  {
    "year": 1922,
    "value": 10.3
  },
  {
    "year": 1923,
    "value": 11
  },
  {
    "year": 1924,
    "value": 10.4
  },
  {
    "year": 1925,
    "value": 10.3
  },
  {
    "year": 1926,
    "value": 10.2
  },
  {
    "year": 1927,
    "value": 10.1
  },
  {
    "year": 1928,
    "value": 9.8
  },
  {
    "year": 1929,
    "value": 10.1
  },
  {
    "year": 1930,
    "value": 9.2
  },
  {
    "year": 1932,
    "value": 7.9
  },
  {
    "year": 1933,
    "value": 8.7
  },
  {
    "year": 1934,
    "value": 10.3
  },
  {
    "year": 1935,
    "value": 10.4
  },
  {
    "year": 1936,
    "value": 10.7
  },
  {
    "year": 1937,
    "value": 11.3
  },
  {
    "year": 1938,
    "value": 10.3
  },
  {
    "year": 1939,
    "value": 10.7
  },
  {
    "year": 1940,
    "value": 12.1
  },
  {
    "year": 1942,
    "value": 13.2
  },
  {
    "year": 1943,
    "value": 11.8
  },
  {
    "year": 1944,
    "value": 11
  },
  {
    "year": 1945,
    "value": 12.1
  },
  {
    "year": 1946,
    "value": 16.4
  },
  {
    "year": 1947,
    "value": 13.9
  },
  {
    "year": 1948,
    "value": 12.4
  },
  {
    "year": 1949,
    "value": 10.6
  },
  {
    "year": 1950,
    "value": 11.1
  },
  {
    "year": 1951,
    "value": 10.4
  },
  {
    "year": 1952,
    "value": 9.9
  },
  {
    "year": 1953,
    "value": 9.8
  },
  {
    "year": 1954,
    "value": 9.2
  },
  {
    "year": 1955,
    "value": 9.3
  },
  {
    "year": 1956,
    "value": 9.5
  },
  {
    "year": 1957,
    "value": 8.9
  },
  {
    "year": 1958,
    "value": 8.4
  },
  {
    "year": 1959,
    "value": 8.5
  },
  {
    "year": 1960,
    "value": 8.5
  },
  {
    "year": 1961,
    "value": 8.5
  },
  {
    "year": 1962,
    "value": 8.5
  },
  {
    "year": 1963,
    "value": 8.8
  },
  {
    "year": 1964,
    "value": 9
  },
  {
    "year": 1965,
    "value": 9.3
  },
  {
    "year": 1966,
    "value": 9.5
  },
  {
    "year": 1967,
    "value": 9.7
  },
  {
    "year": 1968,
    "value": 10.4
  },
  {
    "year": 1969,
    "value": 10.6
  },
  {
    "year": 1970,
    "value": 10.6
  },
  {
    "year": 1971,
    "value": 10.6
  },
  {
    "year": 1972,
    "value": 10.9
  },
  {
    "year": 1973,
    "value": 10.8
  },
  {
    "year": 1974,
    "value": 10.5
  },
  {
    "year": 1975,
    "value": 10
  },
  {
    "year": 1976,
    "value": 9.9
  },
  {
    "year": 1977,
    "value": 9.9
  },
  {
    "year": 1978,
    "value": 10.3
  },
  {
    "year": 1979,
    "value": 10.4
  },
  {
    "year": 1980,
    "value": 10.6
  },
  {
    "year": 1981,
    "value": 10.6
  },
  {
    "year": 1982,
    "value": 10.6
  },
  {
    "year": 1983,
    "value": 10.5
  },
  {
    "year": 1984,
    "value": 10.5
  },
  {
    "year": 1985,
    "value": 10.1
  },
  {
    "year": 1986,
    "value": 10
  },
  {
    "year": 1987,
    "value": 9.9
  },
  {
    "year": 1988,
    "value": 9.8
  },
  {
    "year": 1989,
    "value": 9.7
  },
  {
    "year": 1991,
    "value": 9.2
  },
  {
    "year": 1992,
    "value": 9
  },
  {
    "year": 1993,
    "value": 9.1
  },
  {
    "year": 1994,
    "value": 8.9
  },
  {
    "year": 1995,
    "value": 8.9
  },
  {
    "year": 1996,
    "value": 8.8
  },
  {
    "year": 1997,
    "value": 8.9
  },
  {
    "year": 1998,
    "value": 8.3
  },
  {
    "year": 1999,
    "value": 8.6
  },
  {
    "year": 2000,
    "value": 8.2
  },
  {
    "year": 2001,
    "value": 8.2
  },
  {
    "year": 2002,
    "value": 8
  },
  {
    "year": 2003,
    "value": 7.7
  },
  {
    "year": 2004,
    "value": 7.8
  },
  {
    "year": 2005,
    "value": 7.6
  },
  {
    "year": 2006,
    "value": 7.5
  },
  {
    "year": 2007,
    "value": 7.3
  },
  {
    "year": 2008,
    "value": 7.1
  },
  {
    "year": 2009,
    "value": 6.8
  },
  {
    "year": 2010,
    "value": 6.8
  },
  {
    "year": 2011,
    "value": 6.8
  },
  {
    "year": 2012,
    "value": 6.8
  },
  {
    "year": 2013,
    "value": 6.8
  },
  {
    "year": 2014,
    "value": 6.9
  },
  {
    "year": 2015,
    "value": 6.9
  },
  {
    "year": 2016,
    "value": 7
  },
  {
    "year": 2017,
    "value": 6.9
  },
  {
    "year": 2018,
    "value": 6.5
  },
  {
    "year": 2019,
    "value": 6.1
  },
  {
    "year": 2020,
    "value": 5.1
  },
  {
    "year": 2021,
    "value": 6
  },
  {
    "year": 2022,
    "value": 6.2
  }
]