Year	Years
1800	30.9
1801	30.9
1802	30.9
1803	30.9
1804	30.9
1805	30.9
1806	30.9
1807	30.9
1808	30.9
1809	30.9
1810	30.9
1811	30.9
1812	30.9
1813	30.9
1814	30.9
1815	30.9
1816	30.9
1817	30.9
1818	30.9
1819	30.9
1820	30.9
1821	30.9
1822	30.9
1823	30.9
1824	30.9
1825	30.9
1826	30.9
1827	30.9
1828	30.9
1829	30.9
1830	30.9
1831	30.9
1832	30.9
1833	30.9
1834	30.9
1835	30.9
1836	30.9
1837	30.9
1838	30.9
1839	30.9
1840	30.9
1841	30.9
1842	30.9
1843	30.9
1844	30.9
1845	30.9
1846	30.9
1847	30.9
1848	30.9
1849	30.9
1850	30.9
1851	30.9
1852	30.9
1853	30.9
1854	30.9
1855	30.9
1856	30.9
1857	30.9
1858	30.9
1859	30.9
1860	30.9
1861	30.9
1862	30.9
1863	30.9
1864	30.9
1865	30.9
1866	30.9
1867	30.9
1868	30.9
1869	30.9
1870	30.9
1871	30.91
1872	30.92
1873	30.93
1874	30.94
1875	30.96
1876	30.97
1877	30.98
1878	30.99
1879	31
1880	31.01
1881	31.02
1882	31.03
1883	31.05
1884	31.06
1885	31.07
1886	31.08
1887	31.09
1888	31.1
1889	31.11
1890	31.12
1891	31.13
1892	31.15
1893	31.16
1894	31.17
1895	31.18
1896	31.19
1897	31.2
1898	31.21
1899	31.22
1900	31.24
1901	31.25
1902	12.85
1903	20.24
1904	31.28
1905	31.29
1906	31.3
1907	31.31
1908	31.32
1909	31.34
1910	31.35
1911	31.36
1912	31.37
1913	31.38
1914	31.39
1915	31.4
1916	31.41
1917	31.43
1918	26.04
1919	31.45
1920	31.46
1921	31.47
1922	31.48
1923	31.49
1924	31.5
1925	31.51
1926	32.24
1927	32.97
1928	33.69
1929	34.42
1930	35.15
1931	35.87
1932	36.6
1933	37.33
1934	38.06
1935	38.79
1936	39.52
1937	40.25
1938	40.98
1939	42.26
1940	43.54
1941	42.05
1942	35.71
1943	38.08
1944	33.37
1945	30.71
1946	42.13
1947	45.67
1948	49.22
1949	52.77
1950	56.32
1951	56.52
1952	56.9
1953	57.28
1954	57.64
1955	58.01
1956	58.36
1957	58.72
1958	59.07
1959	59.41
1960	59.75
1961	60.08
1962	60.43
1963	60.76
1964	61.08
1965	61.41
1966	61.74
1967	62.07
1968	62.41
1969	62.73
1970	63.03
1971	63.32
1972	63.29
1973	63.48
1974	63.65
1975	63.85
1976	63.67
1977	64.24
1978	64.42
1979	64.72
1980	64.88
1981	65.03
1982	65.15
1983	65.42
1984	65.46
1985	65.61
1986	65.79
1987	65.95
1988	66.41
1989	66.9
1990	67.18
1991	67.34
1992	67.73
1993	67.9
1994	68.08
1995	68.16
1996	68.34
1997	68.41
1998	68.38
1999	68.35
2000	68.24
2001	68.25
2002	68.23
2003	68.21
2004	68.21
2005	68.33
2006	68.32
2007	68.55
2008	68.67
2009	68.82
2010	69.03
2011	69.17
2012	69.33
2013	69.4
2014	69.82
2015	70.06
2016	70.26
2017	70.4
2018	70.55