Year	Total
1800	6.47
1801	6.47
1802	6.47
1803	6.47
1804	6.47
1805	6.47
1806	6.47
1807	6.47
1808	6.47
1809	6.47
1810	6.47
1811	6.47
1812	6.47
1813	6.47
1814	6.47
1815	6.47
1816	6.47
1817	6.47
1818	6.47
1819	6.47
1820	6.47
1821	6.47
1822	6.48
1823	6.48
1824	6.48
1825	6.48
1826	6.48
1827	6.48
1828	6.48
1829	6.48
1830	6.48
1831	6.48
1832	6.48
1833	6.48
1834	6.48
1835	6.48
1836	6.48
1837	6.48
1838	6.48
1839	6.48
1840	6.48
1841	6.48
1842	6.48
1843	6.48
1844	6.48
1845	6.48
1846	6.48
1847	6.48
1848	6.48
1849	6.48
1850	6.48
1851	6.48
1852	6.48
1853	6.48
1854	6.48
1855	6.48
1856	6.48
1857	6.48
1858	6.49
1859	6.49
1860	6.49
1861	6.49
1862	6.49
1863	6.49
1864	6.49
1865	6.49
1866	6.49
1867	6.49
1868	6.49
1869	6.49
1870	6.49
1871	6.49
1872	6.49
1873	6.49
1874	6.49
1875	6.49
1876	6.49
1877	6.49
1878	6.49
1879	6.49
1880	6.49
1881	6.49
1882	6.49
1883	6.49
1884	6.49
1885	6.49
1886	6.49
1887	6.49
1888	6.49
1889	6.49
1890	6.49
1891	6.49
1892	6.49
1893	6.5
1894	6.5
1895	6.5
1896	6.5
1897	6.5
1898	6.5
1899	6.5
1900	6.5
1901	6.5
1902	6.5
1903	6.5
1904	6.5
1905	6.5
1906	6.5
1907	6.5
1908	6.5
1909	6.5
1910	6.5
1911	6.5
1912	6.5
1913	6.5
1914	6.5
1915	6.5
1916	6.5
1917	6.5
1918	6.5
1919	6.5
1920	6.5
1921	6.5
1922	6.5
1923	6.5
1924	6.5
1925	6.5
1926	6.5
1927	6.5
1928	6.5
1929	6.5
1930	6.5
1931	6.5
1932	6.49
1933	6.49
1934	6.49
1935	6.49
1936	6.49
1937	6.49
1938	6.49
1939	6.48
1940	6.48
1941	6.48
1942	6.48
1943	6.48
1944	6.48
1945	6.48
1946	6.47
1947	6.47
1948	6.47
1949	6.47
1950	6.47
1951	6.48
1952	6.49
1953	6.51
1954	6.52
1955	6.54
1956	6.55
1957	6.57
1958	6.58
1959	6.6
1960	6.62
1961	6.63
1962	6.65
1963	6.67
1964	6.68
1965	6.69
1966	6.7
1967	6.7
1968	6.69
1969	6.67
1970	6.65
1971	6.62
1972	6.58
1973	6.55
1974	6.51
1975	6.47
1976	6.43
1977	6.39
1978	6.35
1979	6.29
1980	6.21
1981	6.11
1982	5.98
1983	5.83
1984	5.64
1985	5.45
1986	5.24
1987	5.04
1988	4.85
1989	4.69
1990	4.54
1991	4.41
1992	4.29
1993	4.18
1994	4.06
1995	3.95
1996	3.84
1997	3.72
1998	3.61
1999	3.49
2000	3.39
2001	3.29
2002	3.19
2003	3.11
2004	3.04
2005	2.99
2006	2.95
2007	2.92
2008	2.9
2009	2.89
2010	2.88
2011	2.88
2012	2.86
2013	2.84
2014	2.81
2015	2.77
2016	2.73
2017	2.68
2018	2.64