Year	Years
1800	33
1801	33
1802	33
1803	33
1804	33
1805	33
1806	33
1807	33
1808	33
1809	33
1810	33
1811	33
1812	33
1813	33
1814	33
1815	33
1816	33
1817	33
1818	33
1819	33
1820	33
1821	33
1822	33
1823	33
1824	33
1825	33
1826	33
1827	33
1828	33
1829	33
1830	33
1831	33
1832	33
1833	33
1834	33
1835	33
1836	33
1837	33
1838	33
1839	33
1840	33
1841	33
1842	33
1843	33
1844	33
1845	33
1846	33
1847	33
1848	33
1849	33
1850	33
1851	33
1852	33
1853	33
1854	33
1855	33
1856	33
1857	33
1858	33
1859	33
1860	33
1861	33
1862	33
1863	33
1864	33
1865	33
1866	33
1867	33
1868	33
1869	33
1870	33
1871	33
1872	33
1873	33
1874	33
1875	33
1876	33
1877	33
1878	33
1879	33
1880	33
1881	33
1882	33
1883	33
1884	33
1885	33
1886	33
1887	33
1888	33
1889	33
1890	33
1891	33
1892	33
1893	33
1894	33
1895	33
1896	33
1897	33
1898	33
1899	33
1900	33
1901	33
1902	33
1903	33
1904	33
1905	33
1906	33
1907	33
1908	33
1909	33
1910	33
1911	33
1912	33
1913	33
1914	33
1915	33
1916	33
1917	33
1918	12.76
1919	33
1920	33
1921	33
1922	33
1923	33
1924	33
1925	33
1926	33
1927	33
1928	33
1929	33
1930	33
1931	33
1932	33
1933	33
1934	33
1935	33
1936	33
1937	33
1938	33
1939	33
1940	33
1941	33
1942	33
1943	33
1944	33
1945	33
1946	35.46
1947	37.92
1948	40.39
1949	42.85
1950	45.31
1951	45.98
1952	47.28
1953	48.53
1954	49.72
1955	50.86
1956	51.94
1957	52.96
1958	53.93
1959	54.85
1960	55.73
1961	56.57
1962	57.37
1963	58.15
1964	58.9
1965	59.64
1966	60.36
1967	61.06
1968	61.74
1969	62.41
1970	63.06
1971	63.69
1972	64.3
1973	64.89
1974	65.46
1975	66
1976	66.53
1977	67.05
1978	67.55
1979	68.03
1980	68.51
1981	68.97
1982	69.43
1983	69.87
1984	70.3
1985	70.73
1986	71.14
1987	71.54
1988	71.94
1989	72.32
1990	72.69
1991	73.06
1992	73.41
1993	73.77
1994	74.11
1995	74.45
1996	74.79
1997	75.12
1998	75.44
1999	75.76
2000	76.08
2001	76.38
2002	76.68
2003	76.97
2004	77.26
2005	77.53
2006	77.81
2007	78.08
2008	78.35
2009	78.62
2010	78.88
2011	79.14
2012	79.4
2013	79.65
2014	79.89
2015	80.12
2016	80.33
2017	80.54
2018	80.75