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	6.62
1930	6.65
1931	6.68
1932	6.7
1933	6.73
1934	6.76
1935	6.78
1936	6.81
1937	6.84
1938	6.87
1939	6.89
1940	6.92
1941	6.95
1942	6.97
1943	7
1944	7.03
1945	7.05
1946	7.08
1947	7.11
1948	7.14
1949	7.16
1950	7.19
1951	7.11
1952	6.97
1953	6.85
1954	6.76
1955	6.69
1956	6.64
1957	6.62
1958	6.61
1959	6.61
1960	6.61
1961	6.6
1962	6.57
1963	6.51
1964	6.4
1965	6.25
1966	6.04
1967	5.77
1968	5.46
1969	5.12
1970	4.77
1971	4.42
1972	4.1
1973	3.81
1974	3.58
1975	3.39
1976	3.25
1977	3.13
1978	3.04
1979	2.96
1980	2.89
1981	2.84
1982	2.8
1983	2.77
1984	2.75
1985	2.74
1986	2.72
1987	2.7
1988	2.66
1989	2.61
1990	2.56
1991	2.5
1992	2.44
1993	2.4
1994	2.36
1995	2.34
1996	2.33
1997	2.33
1998	2.34
1999	2.36
2000	2.38
2001	2.4
2002	2.42
2003	2.43
2004	2.43
2005	2.43
2006	2.42
2007	2.42
2008	2.41
2009	2.41
2010	2.41
2011	2.4
2012	2.4
2013	2.38
2014	2.37
2015	2.35
2016	2.32
2017	2.29
2018	2.27