Year	Years
1800	35
1801	35
1802	35
1803	35
1804	35
1805	35
1806	35
1807	35
1808	35
1809	35
1810	35
1811	35
1812	35
1813	35
1814	35
1815	35
1816	35
1817	35
1818	35
1819	35
1820	35
1821	35
1822	35
1823	35
1824	35
1825	35
1826	35
1827	35
1828	35
1829	35
1830	35
1831	35
1832	35
1833	35
1834	35
1835	35
1836	35
1837	35
1838	35
1839	35
1840	35
1841	35
1842	35
1843	35
1844	35
1845	35
1846	35
1847	35
1848	35
1849	35
1850	35
1851	35
1852	35
1853	35
1854	35
1855	35
1856	35
1857	35
1858	35
1859	35
1860	35
1861	35
1862	35
1863	35
1864	35
1865	35
1866	35
1867	35
1868	35
1869	35
1870	35
1871	35.03
1872	35.05
1873	35.08
1874	35.1
1875	35.13
1876	35.15
1877	35.18
1878	35.2
1879	35.23
1880	35.25
1881	35.28
1882	35.3
1883	35.33
1884	35.36
1885	35.38
1886	35.41
1887	35.43
1888	35.46
1889	35.48
1890	35.51
1891	35.53
1892	35.56
1893	35.58
1894	35.61
1895	35.63
1896	35.66
1897	35.69
1898	35.71
1899	35.74
1900	35.76
1901	35.79
1902	35.81
1903	35.84
1904	35.86
1905	35.89
1906	35.91
1907	35.94
1908	35.97
1909	35.99
1910	36.02
1911	36.04
1912	36.07
1913	36.09
1914	36.12
1915	36.14
1916	36.17
1917	36.19
1918	23.21
1919	36.24
1920	36.27
1921	36.3
1922	36.32
1923	36.35
1924	36.37
1925	36.4
1926	36.42
1927	36.45
1928	36.47
1929	36.5
1930	36.52
1931	36.55
1932	36.57
1933	36.6
1934	36.63
1935	36.65
1936	36.68
1937	36.7
1938	36.73
1939	36.75
1940	35.73
1941	35.33
1942	35.25
1943	35.17
1944	33.19
1945	29.52
1946	36.93
1947	38.21
1948	39.51
1949	40.79
1950	42.09
1951	42.26
1952	42.55
1953	42.81
1954	43.03
1955	43.22
1956	43.39
1957	43.52
1958	43.64
1959	43.77
1960	43.9
1961	44.07
1962	44.28
1963	44.52
1964	44.76
1965	45
1966	45.28
1967	45.53
1968	45.65
1969	45.51
1970	44.68
1971	44.95
1972	45.2
1973	45.21
1974	45.2
1975	24.75
1976	24.68
1977	24.47
1978	24.23
1979	23.98
1980	52.54
1981	52.83
1982	53.14
1983	53.47
1984	53.82
1985	54.15
1986	54.48
1987	56.34
1988	56.93
1989	56.98
1990	57.37
1991	57.72
1992	58.06
1993	58.11
1994	58.01
1995	58.16
1996	58.32
1997	58.57
1998	58.84
1999	59.17
2000	59.47
2001	60.07
2002	60.67
2003	61.33
2004	62.04
2005	62.88
2006	63.75
2007	64.5
2008	65.17
2009	65.69
2010	66.12
2011	66.61
2012	67.17
2013	67.58
2014	67.96
2015	68.32
2016	68.66
2017	69.01
2018	69.35