Year	Years
1800	31.8
1801	25
1802	25
1803	31.8
1804	31.8
1805	31.8
1806	31.8
1807	31.8
1808	31.8
1809	31.8
1810	31.8
1811	31.8
1812	31.8
1813	31.8
1814	31.8
1815	31.8
1816	31.8
1817	31.8
1818	31.8
1819	31.8
1820	31.8
1821	31.8
1822	31.8
1823	31.8
1824	31.8
1825	31.8
1826	31.8
1827	31.8
1828	31.8
1829	31.8
1830	31.8
1831	31.8
1832	31.8
1833	31.8
1834	31.8
1835	31.8
1836	31.8
1837	31.8
1838	31.8
1839	31.8
1840	31.8
1841	31.8
1842	31.8
1843	31.8
1844	31.8
1845	31.8
1846	31.8
1847	31.8
1848	31.8
1849	31.8
1850	31.8
1851	31.8
1852	31.8
1853	31.8
1854	31.8
1855	31.8
1856	31.8
1857	31.8
1858	31.8
1859	31.8
1860	31.8
1861	31.8
1862	31.8
1863	31.8
1864	31.8
1865	31.8
1866	31.8
1867	31.8
1868	31.8
1869	31.8
1870	31.8
1871	31.82
1872	31.83
1873	31.85
1874	31.86
1875	31.88
1876	31.89
1877	31.91
1878	31.93
1879	31.94
1880	31.96
1881	31.97
1882	31.99
1883	32
1884	32.02
1885	32.04
1886	32.05
1887	32.07
1888	32.08
1889	32.1
1890	32.11
1891	32.13
1892	32.15
1893	32.16
1894	32.18
1895	32.19
1896	32.21
1897	28.37
1898	27.37
1899	26.37
1900	25.37
1901	24.37
1902	23.36
1903	22.36
1904	32.34
1905	32.35
1906	26.46
1907	25.46
1908	24.45
1909	32.41
1910	32.43
1911	32.45
1912	32.46
1913	32.48
1914	32.49
1915	32.51
1916	26.59
1917	24.56
1918	12.59
1919	32.57
1920	32.59
1921	32.6
1922	32.62
1923	32.63
1924	26.7
1925	25.68
1926	24.67
1927	32.7
1928	26.75
1929	24.7
1930	32.74
1931	32.76
1932	33.2
1933	33.65
1934	34.09
1935	34.54
1936	34.98
1937	35.43
1938	35.87
1939	36.32
1940	36.76
1941	37.21
1942	37.66
1943	35.23
1944	20.17
1945	38.9
1946	39.32
1947	39.73
1948	40.14
1949	40.56
1950	40.97
1951	41.15
1952	41.47
1953	41.8
1954	42.13
1955	42.47
1956	42.81
1957	43.14
1958	43.49
1959	43.83
1960	44.16
1961	44.5
1962	44.82
1963	45.13
1964	45.42
1965	45.68
1966	45.91
1967	46.12
1968	46.31
1969	46.47
1970	46.6
1971	46.73
1972	46.89
1973	47.08
1974	47.22
1975	47.35
1976	47.63
1977	47.98
1978	48.38
1979	49.09
1980	49.92
1981	50.79
1982	51.49
1983	51.99
1984	52.25
1985	52.36
1986	52.45
1987	52.17
1988	51.6
1989	50.76
1990	49.14
1991	48.55
1992	47.86
1993	47.24
1994	12.64
1995	44.61
1996	45.92
1997	45.31
1998	46.6
1999	47.95
2000	49.37
2001	50.59
2002	52.54
2003	54.08
2004	55.86
2005	57.7
2006	59.48
2007	61.08
2008	62.47
2009	63.3
2010	64.59
2011	65.35
2012	66
2013	66.49
2014	66.93
2015	67.31
2016	67.65
2017	68.02
2018	68.33