Year	Years
1800	27.5
1801	27.5
1802	27.5
1803	27.5
1804	27.5
1805	27.5
1806	27.5
1807	27.5
1808	27.5
1809	27.5
1810	27.5
1811	27.5
1812	27.5
1813	27.5
1814	27.5
1815	27.5
1816	27.5
1817	27.5
1818	27.5
1819	27.5
1820	27.5
1821	27.5
1822	27.5
1823	27.5
1824	27.5
1825	27.5
1826	27.5
1827	27.5
1828	27.5
1829	27.5
1830	27.5
1831	27.5
1832	27.5
1833	27.5
1834	27.5
1835	27.5
1836	27.5
1837	27.5
1838	27.5
1839	27.5
1840	27.5
1841	27.5
1842	27.5
1843	27.5
1844	27.5
1845	27.5
1846	27.5
1847	27.5
1848	27.5
1849	27.5
1850	27.5
1851	27.5
1852	27.5
1853	27.5
1854	27.5
1855	27.5
1856	27.5
1857	27.5
1858	27.5
1859	27.5
1860	27.5
1861	27.5
1862	27.5
1863	27.5
1864	27.5
1865	27.5
1866	27.5
1867	27.5
1868	27.5
1869	27.5
1870	27.5
1871	27.51
1872	27.52
1873	27.53
1874	27.54
1875	27.55
1876	27.56
1877	27.57
1878	27.58
1879	27.59
1880	27.6
1881	27.61
1882	27.62
1883	27.63
1884	27.63
1885	27.64
1886	27.65
1887	27.66
1888	27.67
1889	27.68
1890	27.69
1891	27.7
1892	27.71
1893	27.72
1894	27.73
1895	27.74
1896	27.75
1897	27.76
1898	27.77
1899	27.78
1900	27.79
1901	27.8
1902	27.81
1903	27.82
1904	27.83
1905	27.84
1906	27.85
1907	27.86
1908	27.87
1909	27.88
1910	27.88
1911	27.89
1912	27.9
1913	27.91
1914	27.92
1915	27.93
1916	27.94
1917	27.95
1918	5.62
1919	27.97
1920	27.98
1921	27.99
1922	28
1923	28.01
1924	28.02
1925	28.03
1926	29.21
1927	30.38
1928	31.57
1929	32.74
1930	33.93
1931	35.1
1932	36.29
1933	37.47
1934	38.66
1935	39.84
1936	41.03
1937	42.21
1938	43.4
1939	44.58
1940	45.77
1941	45.71
1942	45.62
1943	45.43
1944	26.67
1945	46.18
1946	51.33
1947	53.4
1948	55.27
1949	56.5
1950	57.7
1951	57.98
1952	58.51
1953	59.05
1954	59.59
1955	60.14
1956	60.68
1957	61.23
1958	61.78
1959	62.34
1960	62.89
1961	63.44
1962	63.98
1963	64.51
1964	65.04
1965	65.55
1966	66.06
1967	66.54
1968	67.02
1969	67.5
1970	67.96
1971	68.1
1972	68.18
1973	68.29
1974	68.5
1975	68.92
1976	69.44
1977	70.07
1978	70.68
1979	71.25
1980	71.64
1981	72.04
1982	72.4
1983	72.7
1984	72.99
1985	73.27
1986	73.4
1987	73.44
1988	73.48
1989	73.44
1990	73.39
1991	73.23
1992	73.22
1993	73.28
1994	73.38
1995	73.56
1996	73.71
1997	70.22
1998	73.9
1999	73.99
2000	74.08
2001	74.12
2002	74.13
2003	74.04
2004	73.85
2005	73.67
2006	73.41
2007	73.06
2008	72.78
2009	72.54
2010	72.36
2011	72.34
2012	72.28
2013	72.28
2014	72.33
2015	72.38
2016	72.57
2017	72.74
2018	72.91