Year	Years
1800	36.6
1801	36.6
1802	36.6
1803	36.6
1804	36.6
1805	36.6
1806	36.6
1807	36.6
1808	36.6
1809	36.6
1810	36.6
1811	36.6
1812	36.6
1813	36.6
1814	36.6
1815	36.6
1816	36.6
1817	36.6
1818	36.6
1819	36.6
1820	36.6
1821	36.6
1822	36.6
1823	36.6
1824	36.6
1825	36.6
1826	36.6
1827	36.6
1828	36.6
1829	36.6
1830	36.6
1831	36.6
1832	36.6
1833	36.6
1834	36.6
1835	36.6
1836	36.6
1837	36.6
1838	36.6
1839	36.6
1840	36.6
1841	36.6
1842	36.6
1843	36.6
1844	36.6
1845	36.6
1846	36.6
1847	36.6
1848	36.6
1849	36.6
1850	36.6
1851	36.6
1852	36.6
1853	36.6
1854	36.6
1855	36.6
1856	36.6
1857	36.6
1858	36.6
1859	36.6
1860	36.6
1861	36.6
1862	36.6
1863	36.6
1864	36.6
1865	36.6
1866	36.6
1867	36.6
1868	36.6
1869	36.6
1870	36.6
1871	36.59
1872	36.59
1873	36.58
1874	36.57
1875	36.56
1876	36.56
1877	36.55
1878	36.54
1879	36.53
1880	36.53
1881	36.52
1882	36.51
1883	36.5
1884	36.5
1885	36.49
1886	36.48
1887	36.47
1888	36.47
1889	36.46
1890	36.45
1891	36.44
1892	36.44
1893	36.43
1894	36.42
1895	36.42
1896	36.41
1897	36.4
1898	36.39
1899	36.39
1900	36.38
1901	36.37
1902	36.36
1903	36.36
1904	36.35
1905	36.34
1906	36.33
1907	36.33
1908	36.32
1909	36.31
1910	36.3
1911	36.3
1912	36.29
1913	36.28
1914	36.27
1915	36.27
1916	36.26
1917	36.25
1918	19.9
1919	36.24
1920	36.23
1921	37.14
1922	38.06
1923	38.97
1924	39.87
1925	40.78
1926	41.69
1927	42.6
1928	43.51
1929	44.42
1930	45.32
1931	46.23
1932	47.14
1933	48.05
1934	48.96
1935	49.87
1936	50.76
1937	51.67
1938	52.58
1939	53.48
1940	54.39
1941	51.45
1942	49.69
1943	48.05
1944	46.62
1945	48.35
1946	54.16
1947	60.05
1948	61.52
1949	62.5
1950	63.41
1951	63.69
1952	64.24
1953	64.77
1954	65.25
1955	65.71
1956	66.13
1957	66.52
1958	66.87
1959	67.17
1960	67.43
1961	67.62
1962	67.77
1963	67.85
1964	67.89
1965	67.89
1966	67.88
1967	67.87
1968	67.89
1969	67.93
1970	68.02
1971	68.29
1972	68.55
1973	68.81
1974	69.08
1975	69.33
1976	69.57
1977	69.8
1978	70.04
1979	70.28
1980	70.48
1981	70.65
1982	70.8
1983	70.86
1984	71.2
1985	71.69
1986	72.1
1987	72.2
1988	72.76
1989	73.08
1990	73.54
1991	73.49
1992	73.68
1993	73.72
1994	74.04
1995	74.47
1996	74.79
1997	75.02
1998	75.24
1999	75.53
2000	75.94
2001	76.19
2002	76.52
2003	76.71
2004	77.1
2005	77.5
2006	77.87
2007	78.23
2008	78.72
2009	79.08
2010	79.45
2011	79.81
2012	80.01
2013	80.26
2014	80.74
2015	80.7
2016	80.82
2017	80.97
2018	81.12