Year	Years
1800	34
1801	34
1802	34
1803	34
1804	34
1805	34
1806	34
1807	34
1808	34
1809	34
1810	34
1811	34
1812	34
1813	34
1814	34
1815	34
1816	34
1817	34
1818	34
1819	34
1820	34
1821	34
1822	34
1823	34
1824	34
1825	34
1826	34
1827	34
1828	34
1829	34
1830	34
1831	34
1832	34
1833	34
1834	34
1835	34
1836	34
1837	34
1838	34
1839	34
1840	34
1841	34
1842	34
1843	34
1844	34
1845	34
1846	34
1847	34
1848	34
1849	34
1850	34
1851	34
1852	34
1853	34
1854	34
1855	34
1856	34
1857	34
1858	34
1859	34
1860	34
1861	34
1862	34
1863	34
1864	33.47
1865	32.95
1866	32.42
1867	31.9
1868	31.38
1869	31.42
1870	31.46
1871	31.49
1872	31.51
1873	31.54
1874	31.72
1875	31.89
1876	32.07
1877	32.25
1878	32.43
1879	32.6
1880	32.78
1881	32.96
1882	33.13
1883	33.31
1884	33.48
1885	33.66
1886	33.83
1887	34.01
1888	34.18
1889	34.36
1890	34.53
1891	34.71
1892	34.88
1893	35.05
1894	35.23
1895	35.4
1896	35.57
1897	35.74
1898	35.55
1899	35.36
1900	35.18
1901	35.4
1902	35.62
1903	35.84
1904	36.06
1905	36.28
1906	36.5
1907	36.72
1908	36.94
1909	37.16
1910	37.38
1911	40.22
1912	40.61
1913	38.47
1914	38.05
1915	37.64
1916	37.61
1917	34.68
1918	26.14
1919	35.79
1920	27.07
1921	36.71
1922	37.65
1923	38.46
1924	40.84
1925	39.95
1926	43
1927	42.33
1928	43.75
1929	42.53
1930	41.84
1931	40.29
1932	37.87
1933	31.61
1934	43.99
1935	45.44
1936	47
1937	46.03
1938	47.61
1939	49.86
1940	47.47
1941	26.67
1942	23.32
1943	21.4
1944	28.52
1945	37.52
1946	53.92
1947	46.29
1948	53.91
1949	56.52
1950	58.66
1951	58.82
1952	59.18
1953	59.53
1954	59.89
1955	60.25
1956	60.6
1957	60.94
1958	61.3
1959	61.66
1960	62.01
1961	62.37
1962	62.74
1963	63.11
1964	63.46
1965	63.83
1966	64.2
1967	64.55
1968	64.89
1969	65.2
1970	65.46
1971	66.05
1972	66.55
1973	67.07
1974	67.56
1975	67.98
1976	68.44
1977	68.83
1978	69.15
1979	69.4
1980	69.63
1981	69.94
1982	70.36
1983	70.31
1984	70.64
1985	70.69
1986	71.19
1987	71.37
1988	55
1989	70.62
1990	70.24
1991	70
1992	69.05
1993	68.66
1994	68.87
1995	69.26
1996	69.55
1997	70.25
1998	70.74
1999	71.17
2000	71.85
2001	72.07
2002	72.46
2003	72.55
2004	72.66
2005	72.5
2006	72.45
2007	72.88
2008	72.81
2009	73.01
2010	73.34
2011	73.8
2012	74.29
2013	74.99
2014	75.36
2015	75.38
2016	75.65
2017	75.81
2018	75.97