Year	Years
1800	25.5
1801	25.5
1802	25.5
1803	25.5
1804	25.5
1805	25.5
1806	25.5
1807	25.5
1808	25.5
1809	25.5
1810	25.5
1811	25.5
1812	25.5
1813	25.5
1814	25.5
1815	25.5
1816	25.5
1817	25.5
1818	25.5
1819	25.5
1820	25.5
1821	25.5
1822	25.5
1823	25.5
1824	25.5
1825	25.5
1826	25.5
1827	25.5
1828	25.5
1829	25.5
1830	25.5
1831	25.5
1832	25.5
1833	25.5
1834	25.5
1835	25.5
1836	25.5
1837	25.5
1838	25.5
1839	25.5
1840	25.5
1841	25.5
1842	25.5
1843	25.5
1844	25.5
1845	25.5
1846	25.5
1847	25.5
1848	25.5
1849	25.5
1850	25.5
1851	25.5
1852	25.5
1853	25.5
1854	25.5
1855	25.5
1856	25.5
1857	25.5
1858	25.5
1859	25.5
1860	25.5
1861	25.5
1862	25.5
1863	25.5
1864	25
1865	24
1866	25.2
1867	25.5
1868	25.5
1869	25.5
1870	25.5
1871	25.48
1872	25.46
1873	25.44
1874	25.42
1875	25.4
1876	25.38
1877	25.14
1878	24.89
1879	24.64
1880	24.39
1881	24.15
1882	23.9
1883	23.65
1884	23.41
1885	23.16
1886	22.92
1887	22.78
1888	22.65
1889	22.51
1890	22.38
1891	21.26
1892	20.65
1893	21.97
1894	21.78
1895	21.58
1896	19.61
1897	18.61
1898	21.4
1899	21.34
1900	21.27
1901	21.22
1902	21.15
1903	21.1
1904	21.03
1905	20.98
1906	20.91
1907	21.06
1908	21.21
1909	21.36
1910	21.51
1911	21.66
1912	21.8
1913	21.95
1914	22.1
1915	22.24
1916	22.39
1917	22.54
1918	12.58
1919	22.83
1920	22.97
1921	23.12
1922	23.26
1923	23.41
1924	23.55
1925	23.7
1926	23.84
1927	24.54
1928	25.24
1929	25.93
1930	26.62
1931	27.32
1932	28.01
1933	28.69
1934	29.38
1935	30.07
1936	30.76
1937	31.44
1938	32.12
1939	32.81
1940	33.49
1941	34.17
1942	31.96
1943	22.25
1944	24.53
1945	34.97
1946	40.52
1947	34.92
1948	36.29
1949	39.48
1950	40.28
1951	40.4
1952	40.68
1953	40.99
1954	41.32
1955	41.67
1956	42.05
1957	42.45
1958	42.88
1959	43.34
1960	43.83
1961	44.33
1962	44.85
1963	45.34
1964	45.79
1965	46.07
1966	46.11
1967	45.87
1968	45.37
1969	44.68
1970	43.97
1971	44.35
1972	52.07
1973	52.09
1974	51.45
1975	52.41
1976	52.61
1977	52.84
1978	53.13
1979	53.49
1980	53.82
1981	54.11
1982	54.39
1983	54.79
1984	55.27
1985	55.26
1986	56.23
1987	56.74
1988	57.1
1989	57.97
1990	58.11
1991	56.47
1992	59.75
1993	60.53
1994	61.29
1995	61.73
1996	62.62
1997	63.5
1998	64.34
1999	65.16
2000	65.48
2001	66.02
2002	66.52
2003	67.07
2004	67.64
2005	68.04
2006	68.5
2007	68.91
2008	69.55
2009	70.07
2010	70.39
2011	70.98
2012	71.25
2013	71.63
2014	72.03
2015	72.41
2016	72.78
2017	73.1
2018	73.41