Year	Total
1800	6.4
1801	6.4
1802	6.4
1803	6.4
1804	6.4
1805	6.4
1806	6.4
1807	6.4
1808	6.4
1809	6.4
1810	6.4
1811	6.4
1812	6.4
1813	6.4
1814	6.4
1815	6.4
1816	6.4
1817	6.4
1818	6.4
1819	6.4
1820	6.4
1821	6.4
1822	6.4
1823	6.4
1824	6.4
1825	6.4
1826	6.4
1827	6.4
1828	6.4
1829	6.4
1830	6.4
1831	6.4
1832	6.4
1833	6.4
1834	6.4
1835	6.4
1836	6.4
1837	6.4
1838	6.4
1839	6.4
1840	6.4
1841	6.4
1842	6.4
1843	6.4
1844	6.4
1845	6.4
1846	6.4
1847	6.4
1848	6.4
1849	6.4
1850	6.4
1851	6.4
1852	6.4
1853	6.4
1854	6.4
1855	6.4
1856	6.4
1857	6.4
1858	6.4
1859	6.4
1860	6.4
1861	6.4
1862	6.4
1863	6.4
1864	6.4
1865	6.4
1866	6.4
1867	6.4
1868	6.4
1869	6.4
1870	6.4
1871	6.4
1872	6.4
1873	6.4
1874	6.4
1875	6.4
1876	6.4
1877	6.4
1878	6.4
1879	6.4
1880	6.4
1881	6.4
1882	6.4
1883	6.4
1884	6.4
1885	6.4
1886	6.4
1887	6.4
1888	6.4
1889	6.4
1890	6.4
1891	6.4
1892	6.4
1893	6.4
1894	6.4
1895	6.4
1896	6.4
1897	6.4
1898	6.4
1899	6.4
1900	6.4
1901	6.4
1902	6.4
1903	6.4
1904	6.4
1905	6.4
1906	6.4
1907	6.4
1908	6.4
1909	6.4
1910	6.4
1911	6.4
1912	6.4
1913	6.4
1914	6.4
1915	6.4
1916	6.4
1917	6.4
1918	6.4
1919	6.4
1920	6.4
1921	6.4
1922	6.4
1923	6.4
1924	6.4
1925	6.4
1926	6.4
1927	6.4
1928	6.4
1929	6.4
1930	6.4
1931	6.38
1932	6.35
1933	6.32
1934	6.3
1935	6.27
1936	6.24
1937	6.22
1938	6.19
1939	6.16
1940	6.13
1941	6.11
1942	6.08
1943	6.05
1944	6.02
1945	5.99
1946	5.96
1947	5.44
1948	4.88
1949	5.77
1950	6.66
1951	6.66
1952	6.68
1953	6.7
1954	6.73
1955	6.77
1956	6.81
1957	6.85
1958	6.88
1959	6.92
1960	6.94
1961	6.97
1962	6.99
1963	7.01
1964	7.02
1965	7.01
1966	6.98
1967	6.94
1968	6.88
1969	6.8
1970	6.71
1971	6.59
1972	6.47
1973	6.33
1974	6.19
1975	6.04
1976	5.89
1977	5.73
1978	5.57
1979	5.41
1980	5.24
1981	5.08
1982	4.92
1983	4.75
1984	4.59
1985	4.43
1986	4.25
1987	4.07
1988	3.88
1989	3.68
1990	3.48
1991	3.28
1992	3.09
1993	2.91
1994	2.75
1995	2.61
1996	2.49
1997	2.38
1998	2.29
1999	2.21
2000	2.14
2001	2.09
2002	2.05
2003	2.02
2004	2
2005	1.99
2006	2
2007	2.02
2008	2.06
2009	2.1
2010	2.14
2011	2.18
2012	2.21
2013	2.23
2014	2.23
2015	2.22
2016	2.2
2017	2.18
2018	2.15