Year	Total
1800	6.51
1801	6.51
1802	6.51
1803	6.51
1804	6.51
1805	6.51
1806	6.51
1807	6.51
1808	6.51
1809	6.51
1810	6.51
1811	6.51
1812	6.51
1813	6.51
1814	6.51
1815	6.51
1816	6.51
1817	6.51
1818	6.51
1819	6.51
1820	6.51
1821	6.51
1822	6.51
1823	6.51
1824	6.51
1825	6.51
1826	6.51
1827	6.51
1828	6.51
1829	6.51
1830	6.51
1831	6.51
1832	6.51
1833	6.51
1834	6.51
1835	6.51
1836	6.51
1837	6.51
1838	6.51
1839	6.51
1840	6.51
1841	6.51
1842	6.51
1843	6.51
1844	6.51
1845	6.51
1846	6.51
1847	6.51
1848	6.51
1849	6.51
1850	6.51
1851	6.51
1852	6.51
1853	6.51
1854	6.51
1855	6.51
1856	6.51
1857	6.51
1858	6.51
1859	6.51
1860	6.51
1861	6.51
1862	6.51
1863	6.51
1864	6.51
1865	6.51
1866	6.51
1867	6.51
1868	6.51
1869	6.51
1870	6.51
1871	6.51
1872	6.51
1873	6.51
1874	6.51
1875	6.51
1876	6.51
1877	6.51
1878	6.51
1879	6.51
1880	6.51
1881	6.51
1882	6.51
1883	6.51
1884	6.51
1885	6.51
1886	6.51
1887	6.51
1888	6.51
1889	6.51
1890	6.51
1891	6.51
1892	6.51
1893	6.51
1894	6.51
1895	6.51
1896	6.51
1897	6.51
1898	6.51
1899	6.51
1900	6.51
1901	6.51
1902	6.51
1903	6.51
1904	6.51
1905	6.51
1906	6.51
1907	6.51
1908	6.51
1909	6.51
1910	6.51
1911	6.51
1912	6.51
1913	6.51
1914	6.51
1915	6.51
1916	6.51
1917	6.51
1918	6.51
1919	6.51
1920	6.51
1921	6.51
1922	6.51
1923	6.51
1924	6.51
1925	6.51
1926	6.54
1927	6.57
1928	6.6
1929	6.64
1930	6.67
1931	6.7
1932	6.74
1933	6.77
1934	6.8
1935	6.83
1936	6.87
1937	6.9
1938	6.93
1939	6.97
1940	7
1941	7.03
1942	7.06
1943	7.1
1944	7.13
1945	7.16
1946	7.2
1947	7.23
1948	7.26
1949	7.29
1950	7.33
1951	7.32
1952	7.3
1953	7.29
1954	7.29
1955	7.29
1956	7.31
1957	7.33
1958	7.35
1959	7.36
1960	7.36
1961	7.35
1962	7.3
1963	7.23
1964	7.12
1965	6.97
1966	6.8
1967	6.59
1968	6.37
1969	6.15
1970	5.94
1971	5.76
1972	5.62
1973	5.51
1974	5.45
1975	5.43
1976	5.44
1977	5.47
1978	5.51
1979	5.54
1980	5.55
1981	5.53
1982	5.48
1983	5.39
1984	5.27
1985	5.13
1986	4.99
1987	4.86
1988	4.76
1989	4.69
1990	4.64
1991	4.61
1992	4.58
1993	4.55
1994	4.5
1995	4.45
1996	4.39
1997	4.34
1998	4.3
1999	4.27
2000	4.25
2001	4.24
2002	4.22
2003	4.2
2004	4.18
2005	4.14
2006	4.1
2007	4.06
2008	4.01
2009	3.96
2010	3.91
2011	3.86
2012	3.82
2013	3.77
2014	3.72
2015	3.68
2016	3.64
2017	3.6
2018	3.56