Year	Years
1800	31.1
1801	31.1
1802	31.1
1803	31.1
1804	31.1
1805	31.1
1806	31.1
1807	31.1
1808	31.1
1809	31.1
1810	31.1
1811	31.1
1812	31.1
1813	31.1
1814	31.1
1815	31.1
1816	31.1
1817	31.1
1818	31.1
1819	31.1
1820	31.1
1821	31.1
1822	31.1
1823	31.1
1824	31.1
1825	31.1
1826	31.1
1827	31.1
1828	31.1
1829	31.1
1830	31.1
1831	31.1
1832	31.1
1833	31.1
1834	31.1
1835	31.1
1836	31.1
1837	31.1
1838	31.1
1839	31.1
1840	31.1
1841	31.1
1842	31.1
1843	31.1
1844	31.1
1845	31.1
1846	31.1
1847	31.1
1848	31.1
1849	31.1
1850	31.1
1851	31.1
1852	31.1
1853	31.1
1854	31.1
1855	31.1
1856	31.1
1857	31.1
1858	31.1
1859	31.1
1860	31.1
1861	31.1
1862	31.1
1863	31.1
1864	31.1
1865	31.1
1866	31.1
1867	31.1
1868	31.1
1869	31.1
1870	31.1
1871	31.13
1872	31.16
1873	31.19
1874	31.22
1875	31.25
1876	31.28
1877	31.31
1878	31.33
1879	31.36
1880	31.39
1881	31.42
1882	31.45
1883	31.48
1884	31.51
1885	31.54
1886	31.57
1887	31.6
1888	31.63
1889	31.66
1890	31.69
1891	31.72
1892	31.74
1893	31.77
1894	31.8
1895	31.83
1896	31.86
1897	31.89
1898	31.92
1899	31.95
1900	31.98
1901	32.01
1902	32.04
1903	32.07
1904	32.1
1905	32.13
1906	32.15
1907	32.18
1908	32.21
1909	32.24
1910	32.27
1911	32.3
1912	32.33
1913	32.36
1914	32.39
1915	32.42
1916	32.45
1917	32.48
1918	26.95
1919	32.54
1920	32.56
1921	32.59
1922	32.62
1923	32.65
1924	32.68
1925	32.71
1926	32.74
1927	32.77
1928	32.8
1929	32.83
1930	32.86
1931	32.89
1932	32.92
1933	32.95
1934	32.97
1935	33
1936	34.19
1937	35.39
1938	36.58
1939	37.79
1940	38.98
1941	40.19
1942	41.39
1943	42.59
1944	43.8
1945	45.01
1946	46.23
1947	47.44
1948	48.66
1949	49.87
1950	51.09
1951	51.46
1952	52.12
1953	52.78
1954	53.44
1955	54.08
1956	54.72
1957	55.35
1958	55.98
1959	56.61
1960	57.24
1961	57.89
1962	58.54
1963	59.21
1964	59.9
1965	60.62
1966	61.38
1967	62.19
1968	63.01
1969	63.87
1970	64.73
1971	65.19
1972	65.75
1973	65.34
1974	66.69
1975	67.19
1976	67.63
1977	68.02
1978	68.44
1979	68.56
1980	68.89
1981	69.17
1982	65.88
1983	69.73
1984	69.99
1985	70.07
1986	70.25
1987	70.41
1988	70.61
1989	70.77
1990	70.96
1991	71.23
1992	71.61
1993	71.75
1994	71.92
1995	72.12
1996	72.31
1997	72.47
1998	72.66
1999	72.97
2000	73.32
2001	73.72
2002	74.02
2003	74.31
2004	74.56
2005	74.91
2006	75.14
2007	75.34
2008	75.51
2009	75.76
2010	76.15
2011	74.98
2012	68.39
2013	69.14
2014	67.18
2015	68.41
2016	68.4
2017	69.03
2018	69.82