Year	Years
1800	31.2
1801	31.2
1802	31.2
1803	31.2
1804	31.2
1805	31.2
1806	31.2
1807	31.2
1808	31.2
1809	31.2
1810	31.2
1811	31.2
1812	31.2
1813	31.2
1814	31.2
1815	31.2
1816	31.2
1817	31.2
1818	31.2
1819	31.2
1820	31.2
1821	31.2
1822	31.2
1823	31.2
1824	31.2
1825	31.2
1826	31.2
1827	31.2
1828	31.2
1829	31.2
1830	31.2
1831	31.2
1832	31.2
1833	31.2
1834	31.2
1835	31.2
1836	31.2
1837	31.2
1838	31.2
1839	31.2
1840	31.2
1841	31.2
1842	31.2
1843	31.2
1844	31.2
1845	31.2
1846	31.2
1847	31.2
1848	31.2
1849	31.2
1850	31.2
1851	31.2
1852	31.2
1853	31.2
1854	31.2
1855	31.2
1856	31.2
1857	31.2
1858	31.2
1859	31.2
1860	31.2
1861	31.2
1862	31.2
1863	31.2
1864	31.2
1865	31.2
1866	31.2
1867	31.2
1868	31.2
1869	31.2
1870	31.2
1871	31.21
1872	31.23
1873	31.24
1874	31.25
1875	31.26
1876	31.28
1877	31.29
1878	31.3
1879	31.32
1880	31.33
1881	31.34
1882	31.35
1883	31.37
1884	31.38
1885	31.39
1886	31.4
1887	31.42
1888	31.43
1889	31.44
1890	31.46
1891	31.47
1892	31.48
1893	31.49
1894	31.51
1895	31.52
1896	31.53
1897	31.55
1898	31.56
1899	31.57
1900	31.58
1901	31.6
1902	31.61
1903	31.62
1904	31.63
1905	31.65
1906	31.66
1907	31.67
1908	31.69
1909	31.7
1910	31.71
1911	31.72
1912	31.74
1913	31.75
1914	31.76
1915	31.78
1916	31.79
1917	31.8
1918	26.38
1919	31.83
1920	31.84
1921	31.85
1922	31.87
1923	31.88
1924	31.89
1925	31.9
1926	31.92
1927	31.93
1928	31.94
1929	31.95
1930	31.97
1931	31.98
1932	31.99
1933	32.01
1934	32.02
1935	32.03
1936	32.04
1937	32.06
1938	32.07
1939	32.08
1940	32.1
1941	32.49
1942	32.87
1943	33.27
1944	33.66
1945	34.05
1946	34.44
1947	34.84
1948	35.22
1949	35.62
1950	36.01
1951	36.84
1952	38.47
1953	40.05
1954	41.57
1955	43.05
1956	44.47
1957	45.86
1958	47.2
1959	48.51
1960	49.79
1961	51.06
1962	52.31
1963	53.55
1964	54.76
1965	55.94
1966	57.05
1967	58.07
1968	59
1969	59.83
1970	60.59
1971	61.56
1972	61.66
1973	61.89
1974	60.58
1975	61.08
1976	63.15
1977	63.6
1978	64.08
1979	64.61
1980	61.22
1981	57.01
1982	57.44
1983	57.69
1984	60.1
1985	60.23
1986	60.42
1987	60.66
1988	49.79
1989	66.03
1990	66.16
1991	62.79
1992	65.63
1993	65.58
1994	65.47
1995	65.27
1996	65.25
1997	64.97
1998	65.72
1999	66
2000	65.99
2001	66.57
2002	66.38
2003	65.03
2004	65.26
2005	64.82
2006	63.89
2007	64.33
2008	66.18
2009	66.87
2010	67.24
2011	67.58
2012	67.86
2013	67.73
2014	67.1
2015	67.59
2016	67.68
2017	67.85
2018	68.02