Year	Total
1800	6.43
1801	6.43
1802	6.43
1803	6.43
1804	6.44
1805	6.44
1806	6.44
1807	6.44
1808	6.44
1809	6.44
1810	6.45
1811	6.45
1812	6.45
1813	6.45
1814	6.45
1815	6.45
1816	6.45
1817	6.46
1818	6.46
1819	6.46
1820	6.46
1821	6.46
1822	6.46
1823	6.46
1824	6.47
1825	6.47
1826	6.47
1827	6.47
1828	6.47
1829	6.47
1830	6.48
1831	6.48
1832	6.48
1833	6.48
1834	6.48
1835	6.48
1836	6.48
1837	6.49
1838	6.49
1839	6.49
1840	6.49
1841	6.49
1842	6.49
1843	6.5
1844	6.5
1845	6.5
1846	6.5
1847	6.5
1848	6.5
1849	6.5
1850	6.51
1851	6.51
1852	6.51
1853	6.51
1854	6.51
1855	6.51
1856	6.52
1857	6.52
1858	6.52
1859	6.52
1860	6.52
1861	6.52
1862	6.52
1863	6.53
1864	6.53
1865	6.53
1866	6.53
1867	6.53
1868	6.53
1869	6.53
1870	6.54
1871	6.54
1872	6.54
1873	6.54
1874	6.54
1875	6.54
1876	6.55
1877	6.55
1878	6.55
1879	6.55
1880	6.55
1881	6.55
1882	6.55
1883	6.56
1884	6.56
1885	6.56
1886	6.56
1887	6.56
1888	6.56
1889	6.57
1890	6.57
1891	6.57
1892	6.57
1893	6.57
1894	6.57
1895	6.57
1896	6.58
1897	6.58
1898	6.58
1899	6.58
1900	6.58
1901	6.58
1902	6.59
1903	6.59
1904	6.59
1905	6.59
1906	6.59
1907	6.59
1908	6.59
1909	6.6
1910	6.6
1911	6.6
1912	6.6
1913	6.6
1914	6.6
1915	6.6
1916	6.61
1917	6.61
1918	6.61
1919	6.61
1920	6.61
1921	6.61
1922	6.62
1923	6.62
1924	6.62
1925	6.62
1926	6.62
1927	6.61
1928	6.61
1929	6.6
1930	6.6
1931	6.59
1932	6.59
1933	6.58
1934	6.58
1935	6.57
1936	6.57
1937	6.56
1938	6.56
1939	6.55
1940	6.55
1941	6.54
1942	6.54
1943	6.53
1944	6.53
1945	6.52
1946	6.52
1947	6.51
1948	6.51
1949	6.5
1950	6.5
1951	6.51
1952	6.55
1953	6.58
1954	6.62
1955	6.66
1956	6.71
1957	6.75
1958	6.8
1959	6.84
1960	6.89
1961	6.92
1962	6.95
1963	6.98
1964	6.99
1965	6.99
1966	6.99
1967	6.98
1968	6.97
1969	6.95
1970	6.94
1971	6.91
1972	6.89
1973	6.86
1974	6.82
1975	6.77
1976	6.71
1977	6.65
1978	6.56
1979	6.47
1980	6.38
1981	6.27
1982	6.17
1983	6.08
1984	5.98
1985	5.88
1986	5.78
1987	5.68
1988	5.57
1989	5.44
1990	5.31
1991	5.16
1992	5.01
1993	4.86
1994	4.7
1995	4.54
1996	4.38
1997	4.22
1998	4.07
1999	3.91
2000	3.76
2001	3.62
2002	3.48
2003	3.36
2004	3.24
2005	3.13
2006	3.02
2007	2.93
2008	2.83
2009	2.75
2010	2.67
2011	2.59
2012	2.53
2013	2.47
2014	2.42
2015	2.37
2016	2.33
2017	2.3
2018	2.27