Year	Total
1800	6.3
1801	6.3
1802	6.3
1803	6.3
1804	6.3
1805	6.3
1806	6.3
1807	6.3
1808	6.3
1809	6.3
1810	6.3
1811	6.3
1812	6.3
1813	6.3
1814	6.3
1815	6.3
1816	6.3
1817	6.3
1818	6.3
1819	6.3
1820	6.3
1821	6.3
1822	6.3
1823	6.3
1824	6.3
1825	6.3
1826	6.3
1827	6.3
1828	6.3
1829	6.3
1830	6.3
1831	6.3
1832	6.3
1833	6.3
1834	6.3
1835	6.3
1836	6.3
1837	6.3
1838	6.3
1839	6.3
1840	6.3
1841	6.3
1842	6.3
1843	6.3
1844	6.3
1845	6.3
1846	6.3
1847	6.3
1848	6.3
1849	6.3
1850	6.3
1851	6.3
1852	6.3
1853	6.3
1854	6.3
1855	6.3
1856	6.3
1857	6.3
1858	6.3
1859	6.3
1860	6.3
1861	6.3
1862	6.3
1863	6.3
1864	6.3
1865	6.3
1866	6.3
1867	6.3
1868	6.3
1869	6.3
1870	6.3
1871	6.3
1872	6.3
1873	6.3
1874	6.3
1875	6.3
1876	6.3
1877	6.3
1878	6.3
1879	6.3
1880	6.3
1881	6.3
1882	6.3
1883	6.3
1884	6.3
1885	6.3
1886	6.3
1887	6.3
1888	6.3
1889	6.3
1890	6.3
1891	6.3
1892	6.3
1893	6.3
1894	6.3
1895	6.3
1896	6.3
1897	6.3
1898	6.3
1899	6.3
1900	6.3
1901	6.3
1902	6.3
1903	6.3
1904	6.3
1905	6.3
1906	6.3
1907	6.3
1908	6.3
1909	6.3
1910	6.3
1911	6.3
1912	6.3
1913	6.3
1914	6.3
1915	6.3
1916	6.3
1917	6.3
1918	6.3
1919	6.3
1920	6.3
1921	6.3
1922	6.3
1923	6.3
1924	6.3
1925	6.3
1926	6.3
1927	6.3
1928	6.3
1929	6.3
1930	6.3
1931	6.3
1932	6.3
1933	6.3
1934	6.3
1935	6.3
1936	6.3
1937	6.3
1938	6.3
1939	6.3
1940	6.3
1941	6.3
1942	6.3
1943	6.3
1944	6.3
1945	6.3
1946	6.3
1947	6.3
1948	6.3
1949	6.3
1950	6.3
1951	6.3
1952	6.31
1953	6.31
1954	6.32
1955	6.34
1956	6.35
1957	6.38
1958	6.4
1959	6.43
1960	6.46
1961	6.49
1962	6.53
1963	6.56
1964	6.6
1965	6.63
1966	6.67
1967	6.7
1968	6.74
1969	6.77
1970	6.8
1971	6.83
1972	6.84
1973	6.83
1974	6.82
1975	6.78
1976	6.73
1977	6.67
1978	6.6
1979	6.52
1980	6.44
1981	6.37
1982	6.32
1983	6.27
1984	6.24
1985	6.22
1986	6.21
1987	6.19
1988	6.17
1989	6.14
1990	6.09
1991	6
1992	5.88
1993	5.73
1994	5.55
1995	5.35
1996	5.15
1997	4.96
1998	4.78
1999	4.62
2000	4.48
2001	4.36
2002	4.24
2003	4.12
2004	3.99
2005	3.87
2006	3.74
2007	3.62
2008	3.5
2009	3.4
2010	3.3
2011	3.21
2012	3.13
2013	3.06
2014	2.98
2015	2.91
2016	2.85
2017	2.79
2018	2.73