Year	Years
1800	28.7
1801	28.7
1802	28.7
1803	28.7
1804	28.7
1805	28.7
1806	28.7
1807	28.7
1808	28.7
1809	28.7
1810	28.7
1811	28.7
1812	28.7
1813	28.7
1814	28.7
1815	28.7
1816	28.7
1817	28.7
1818	28.7
1819	28.7
1820	28.7
1821	28.7
1822	28.7
1823	28.7
1824	28.7
1825	28.7
1826	28.7
1827	28.7
1828	28.7
1829	28.7
1830	28.7
1831	28.7
1832	28.7
1833	28.7
1834	28.7
1835	28.7
1836	28.7
1837	28.7
1838	28.7
1839	28.7
1840	28.7
1841	28.7
1842	28.7
1843	28.7
1844	28.7
1845	28.7
1846	28.7
1847	28.7
1848	28.7
1849	28.7
1850	28.7
1851	28.7
1852	28.7
1853	28.7
1854	28.7
1855	28.7
1856	28.7
1857	28.7
1858	28.7
1859	28.7
1860	28.7
1861	28.7
1862	28.7
1863	28.7
1864	28.7
1865	28.7
1866	28.7
1867	28.7
1868	28.7
1869	28.7
1870	28.7
1871	28.7
1872	28.69
1873	29.16
1874	29.63
1875	30.1
1876	30.56
1877	31.03
1878	31.5
1879	31.97
1880	32.43
1881	32.9
1882	33.37
1883	33.84
1884	34.3
1885	34.77
1886	35.24
1887	35.7
1888	36.17
1889	36.64
1890	37.1
1891	37.57
1892	38.03
1893	38.5
1894	38.96
1895	39.43
1896	39.89
1897	40.36
1898	40.82
1899	41.29
1900	41.76
1901	42.22
1902	42.68
1903	43.14
1904	43.62
1905	44.08
1906	44.54
1907	45
1908	45.47
1909	45.93
1910	46.39
1911	46.85
1912	47.32
1913	47.78
1914	48.24
1915	48.71
1916	49.17
1917	49.63
1918	46.81
1919	50.56
1920	51.02
1921	51.48
1922	51.94
1923	52.41
1924	52.87
1925	53.32
1926	53.79
1927	54.25
1928	54.71
1929	55.17
1930	55.64
1931	56.09
1932	56.55
1933	57.01
1934	57.48
1935	57.93
1936	58.05
1937	58.17
1938	58.29
1939	58.41
1940	56.92
1941	52.46
1942	55.42
1943	60.36
1944	61.83
1945	62.53
1946	62.98
1947	63.44
1948	63.89
1949	64.36
1950	64.82
1951	64.86
1952	64.96
1953	65.09
1954	65.25
1955	65.44
1956	65.66
1957	65.89
1958	66.15
1959	66.43
1960	66.72
1961	67.02
1962	67.33
1963	67.62
1964	67.91
1965	68.18
1966	68.46
1967	68.73
1968	68.98
1969	69.25
1970	69.51
1971	69.77
1972	70.14
1973	70.36
1974	70.59
1975	70.69
1976	70.82
1977	70.98
1978	71.01
1979	71.29
1980	71.54
1981	71.89
1982	72.09
1983	72.5
1984	73.05
1985	73.59
1986	74.28
1987	74.87
1988	75.19
1989	75.46
1990	75.73
1991	75.92
1992	76.11
1993	76.51
1994	76.83
1995	77.1
1996	77.29
1997	77.37
1998	77.4
1999	77.35
2000	77.49
2001	77.78
2002	78.11
2003	78.53
2004	78.82
2005	79.14
2006	79.4
2007	79.57
2008	79.74
2009	80.05
2010	80.28
2011	80.44
2012	80.68
2013	80.99
2014	81.22
2015	81.33
2016	81.43
2017	81.59
2018	81.75