Year	Total
1800	4.7
1801	4.7
1802	4.7
1803	4.7
1804	4.7
1805	4.7
1806	4.7
1807	4.7
1808	4.7
1809	4.7
1810	4.7
1811	4.7
1812	4.7
1813	4.7
1814	4.7
1815	4.7
1816	4.7
1817	4.7
1818	4.7
1819	4.7
1820	4.7
1821	4.7
1822	4.7
1823	4.7
1824	4.7
1825	4.7
1826	4.7
1827	4.7
1828	4.7
1829	4.7
1830	4.7
1831	4.7
1832	4.7
1833	4.7
1834	4.7
1835	4.7
1836	4.7
1837	4.7
1838	4.7
1839	4.7
1840	4.7
1841	4.7
1842	4.7
1843	4.7
1844	4.7
1845	4.7
1846	4.7
1847	4.7
1848	4.7
1849	4.7
1850	4.7
1851	4.7
1852	4.7
1853	4.7
1854	4.7
1855	4.7
1856	4.7
1857	4.7
1858	4.7
1859	4.7
1860	4.7
1861	4.7
1862	4.7
1863	4.7
1864	4.7
1865	4.7
1866	4.7
1867	4.7
1868	4.7
1869	4.7
1870	4.7
1871	4.7
1872	4.7
1873	4.7
1874	4.7
1875	4.7
1876	4.7
1877	4.7
1878	4.7
1879	4.7
1880	4.7
1881	4.7
1882	4.7
1883	4.7
1884	4.7
1885	4.7
1886	4.7
1887	4.7
1888	4.7
1889	4.7
1890	4.7
1891	4.7
1892	4.7
1893	4.7
1894	4.7
1895	4.7
1896	4.7
1897	4.7
1898	4.7
1899	4.7
1900	4.7
1901	4.66
1902	4.62
1903	4.57
1904	4.53
1905	4.49
1906	4.45
1907	4.41
1908	4.36
1909	4.32
1910	4.28
1911	4.24
1912	4.2
1913	4.15
1914	4.15
1915	4.42
1916	4.42
1917	4.69
1918	4.69
1919	4.29
1920	4.15
1921	4.29
1922	4.69
1923	4.49
1924	4.76
1925	4.73
1926	4.7
1927	4.7
1928	4.66
1929	4.78
1930	5.03
1931	4.69
1932	4.69
1933	4.73
1934	5.19
1935	4.92
1936	4.97
1937	5.04
1938	5.03
1939	5.03
1940	5.02
1941	5.02
1942	5.01
1943	5
1944	5
1945	4.99
1946	4.99
1947	4.98
1948	4.97
1949	4.97
1950	4.96
1951	5.08
1952	5.31
1953	5.52
1954	5.7
1955	5.86
1956	6
1957	6.12
1958	6.21
1959	6.29
1960	6.35
1961	6.39
1962	6.43
1963	6.45
1964	6.46
1965	6.48
1966	6.49
1967	6.49
1968	6.49
1969	6.49
1970	6.47
1971	6.42
1972	6.35
1973	6.25
1974	6.13
1975	5.97
1976	5.8
1977	5.61
1978	5.42
1979	5.23
1980	5.05
1981	4.87
1982	4.69
1983	4.52
1984	4.36
1985	4.21
1986	4.06
1987	3.93
1988	3.8
1989	3.68
1990	3.55
1991	3.42
1992	3.26
1993	3.09
1994	2.9
1995	2.71
1996	2.53
1997	2.36
1998	2.21
1999	2.1
2000	2.01
2001	1.95
2002	1.92
2003	1.9
2004	1.89
2005	1.89
2006	1.9
2007	1.91
2008	1.92
2009	1.94
2010	1.95
2011	1.95
2012	1.96
2013	1.96
2014	1.96
2015	1.96
2016	1.95
2017	1.95
2018	1.95