Year	Years
1800	30.8
1801	30.8
1802	30.8
1803	30.8
1804	30.8
1805	30.8
1806	30.8
1807	30.8
1808	30.8
1809	30.8
1810	30.8
1811	30.8
1812	30.8
1813	30.8
1814	30.8
1815	30.8
1816	30.8
1817	30.8
1818	30.8
1819	30.8
1820	30.8
1821	30.8
1822	30.8
1823	30.8
1824	30.8
1825	30.8
1826	30.8
1827	30.8
1828	30.8
1829	30.8
1830	30.8
1831	30.8
1832	30.8
1833	30.8
1834	30.8
1835	30.8
1836	30.8
1837	30.8
1838	30.8
1839	30.8
1840	30.8
1841	30.8
1842	30.8
1843	30.8
1844	30.8
1845	30.8
1846	30.8
1847	30.8
1848	30.8
1849	30.8
1850	30.8
1851	30.8
1852	30.8
1853	30.8
1854	30.8
1855	30.8
1856	30.8
1857	30.8
1858	30.8
1859	30.8
1860	30.8
1861	30.8
1862	30.8
1863	30.8
1864	30.8
1865	30.8
1866	30.8
1867	30.8
1868	30.8
1869	30.8
1870	30.8
1871	30.78
1872	30.77
1873	30.75
1874	30.74
1875	30.72
1876	30.71
1877	30.69
1878	30.68
1879	30.66
1880	30.65
1881	30.63
1882	30.62
1883	30.6
1884	30.58
1885	30.57
1886	30.55
1887	30.54
1888	30.52
1889	30.51
1890	30.49
1891	30.48
1892	30.46
1893	30.45
1894	30.43
1895	30.42
1896	30.4
1897	30.39
1898	30.37
1899	30.35
1900	30.34
1901	30.32
1902	30.31
1903	30.29
1904	30.28
1905	30.26
1906	30.25
1907	30.23
1908	30.22
1909	30.2
1910	30.19
1911	30.17
1912	30.15
1913	30.14
1914	30.12
1915	30.11
1916	30.09
1917	30.08
1918	17.7
1919	30.05
1920	30.03
1921	30.02
1922	30
1923	29.99
1924	29.97
1925	29.96
1926	29.94
1927	29.92
1928	29.91
1929	29.89
1930	29.88
1931	29.86
1932	29.85
1933	29.83
1934	29.82
1935	29.8
1936	29.79
1937	29.77
1938	29.76
1939	29.74
1940	29.72
1941	29.71
1942	26.99
1943	27.46
1944	27.06
1945	26.95
1946	27.83
1947	28.72
1948	29.6
1949	30.78
1950	31.95
1951	32.67
1952	34.06
1953	35.31
1954	36.42
1955	37.39
1956	38.25
1957	38.98
1958	39.62
1959	40.21
1960	40.79
1961	41.41
1962	42.11
1963	42.9
1964	43.8
1965	44.74
1966	45.68
1967	46.56
1968	47.32
1969	47.95
1970	48.45
1971	49.75
1972	50.52
1973	51.24
1974	51.94
1975	52.54
1976	53.25
1977	53.79
1978	54.27
1979	55.04
1980	55.43
1981	55.81
1982	56.18
1983	56.56
1984	56.94
1985	57.31
1986	57.67
1987	57.93
1988	57.96
1989	58.41
1990	58.59
1991	58.75
1992	58.93
1993	59.11
1994	59.36
1995	59.56
1996	59.9
1997	60.14
1998	60.45
1999	60.77
2000	61.13
2001	61.54
2002	61.98
2003	62.5
2004	63.04
2005	63.6
2006	64.28
2007	64.95
2008	59.78
2009	66.22
2010	66.84
2011	67.37
2012	67.97
2013	68.53
2014	69.06
2015	69.52
2016	70.04
2017	70.18
2018	70.31