Year	Years
1800	35.9
1801	35.9
1802	35.9
1803	35.9
1804	35.9
1805	35.9
1806	35.9
1807	35.9
1808	35.9
1809	35.9
1810	35.9
1811	35.9
1812	35.9
1813	35.9
1814	35.9
1815	35.9
1816	35.9
1817	35.9
1818	35.9
1819	35.9
1820	35.9
1821	35.9
1822	35.9
1823	35.9
1824	35.9
1825	35.9
1826	35.9
1827	35.9
1828	35.9
1829	35.9
1830	35.9
1831	35.9
1832	35.9
1833	35.9
1834	35.9
1835	35.9
1836	35.9
1837	35.9
1838	35.9
1839	35.9
1840	35.9
1841	35.9
1842	35.9
1843	35.9
1844	35.9
1845	35.9
1846	35.9
1847	35.9
1848	35.9
1849	35.9
1850	35.9
1851	35.9
1852	35.9
1853	35.9
1854	35.9
1855	35.9
1856	35.9
1857	35.9
1858	35.9
1859	35.9
1860	35.9
1861	35.9
1862	35.9
1863	35.9
1864	35.9
1865	35.9
1866	35.9
1867	35.9
1868	35.9
1869	35.9
1870	35.9
1871	35.9
1872	35.9
1873	35.9
1874	35.9
1875	35.9
1876	35.9
1877	35.9
1878	35.9
1879	35.9
1880	35.9
1881	35.9
1882	35.9
1883	35.9
1884	35.9
1885	35.9
1886	36.2
1887	36.5
1888	36.81
1889	37.11
1890	37.41
1891	37.71
1892	38.02
1893	38.32
1894	38.62
1895	38.91
1896	39.21
1897	39.52
1898	39.82
1899	40.12
1900	40.42
1901	40.72
1902	41.03
1903	41.33
1904	41.63
1905	41.93
1906	42.24
1907	42.54
1908	42.84
1909	43.14
1910	43.44
1911	43.75
1912	44.05
1913	44.35
1914	44.65
1915	44.96
1916	45.26
1917	45.56
1918	38.63
1919	46.16
1920	46.47
1921	46.77
1922	47.07
1923	47.37
1924	47.67
1925	47.98
1926	48.28
1927	48.58
1928	48.88
1929	49.18
1930	49.48
1931	49.78
1932	50.27
1933	50.75
1934	51.24
1935	51.73
1936	52.21
1937	52.7
1938	53.19
1939	44.98
1940	44.68
1941	41.08
1942	33.39
1943	23.59
1944	15.39
1945	34.29
1946	46.98
1947	53.98
1948	56.98
1949	57.98
1950	59.03
1951	59.62
1952	60.8
1953	61.89
1954	62.9
1955	63.82
1956	64.66
1957	65.42
1958	65.89
1959	65.5
1960	67.83
1961	67.95
1962	67.61
1963	68.54
1964	68.77
1965	69.47
1966	69.87
1967	69.57
1968	70.21
1969	69.7
1970	69.83
1971	69.89
1972	70.57
1973	70.73
1974	71.17
1975	70.8
1976	70.8
1977	70.6
1978	70.64
1979	70.86
1980	70.43
1981	71.16
1982	71.24
1983	71.12
1984	70.88
1985	70.71
1986	70.93
1987	70.97
1988	71.28
1989	71.08
1990	70.98
1991	70.74
1992	71.12
1993	71.65
1994	71.65
1995	71.87
1996	72.31
1997	72.63
1998	73
1999	73.14
2000	73.76
2001	74.23
2002	74.61
2003	74.9
2004	75.04
2005	75.18
2006	75.29
2007	75.39
2008	75.61
2009	75.85
2010	76.3
2011	76.55
2012	76.7
2013	77.03
2014	77.52
2015	77.71
2016	77.89
2017	78.04
2018	78.19