Year	Total
1800	6.93
1801	6.93
1802	6.93
1803	6.93
1804	6.93
1805	6.93
1806	6.93
1807	6.94
1808	6.94
1809	6.94
1810	6.94
1811	6.94
1812	6.94
1813	6.94
1814	6.94
1815	6.94
1816	6.94
1817	6.94
1818	6.94
1819	6.94
1820	6.94
1821	6.95
1822	6.95
1823	6.95
1824	6.95
1825	6.95
1826	6.95
1827	6.95
1828	6.95
1829	6.95
1830	6.95
1831	6.95
1832	6.95
1833	6.95
1834	6.95
1835	6.96
1836	6.96
1837	6.96
1838	6.96
1839	6.96
1840	6.96
1841	6.96
1842	6.96
1843	6.96
1844	6.96
1845	6.96
1846	6.96
1847	6.96
1848	6.96
1849	6.97
1850	6.97
1851	6.97
1852	6.97
1853	6.97
1854	6.97
1855	6.97
1856	6.97
1857	6.97
1858	6.97
1859	6.97
1860	6.97
1861	6.97
1862	6.97
1863	6.98
1864	6.98
1865	6.98
1866	6.98
1867	6.98
1868	6.98
1869	6.98
1870	6.98
1871	6.98
1872	6.98
1873	6.98
1874	6.98
1875	6.98
1876	6.98
1877	6.99
1878	6.99
1879	6.99
1880	6.99
1881	6.99
1882	6.99
1883	6.99
1884	6.99
1885	6.99
1886	6.99
1887	6.99
1888	6.99
1889	6.99
1890	6.99
1891	7
1892	7
1893	7
1894	7
1895	7
1896	7
1897	7
1898	7
1899	7
1900	7
1901	7
1902	7
1903	7
1904	7
1905	7.01
1906	7.01
1907	7.01
1908	7.01
1909	7.01
1910	7.01
1911	7.01
1912	7.01
1913	7.01
1914	7.01
1915	7.01
1916	7.01
1917	7.01
1918	7.01
1919	7.02
1920	7.02
1921	7.02
1922	7.02
1923	7.02
1924	7.02
1925	7.02
1926	7.02
1927	7.01
1928	7.01
1929	7
1930	7
1931	7
1932	7
1933	6.99
1934	6.99
1935	6.99
1936	7
1937	7
1938	7
1939	7
1940	7.01
1941	7.02
1942	7.02
1943	7.03
1944	7.04
1945	7.05
1946	7.06
1947	7.07
1948	7.08
1949	7.1
1950	7.11
1951	7.13
1952	7.15
1953	7.17
1954	7.2
1955	7.23
1956	7.27
1957	7.31
1958	7.36
1959	7.42
1960	7.48
1961	7.52
1962	7.56
1963	7.59
1964	7.61
1965	7.62
1966	7.62
1967	7.61
1968	7.61
1969	7.6
1970	7.6
1971	7.6
1972	7.61
1973	7.61
1974	7.61
1975	7.62
1976	7.61
1977	7.59
1978	7.57
1979	7.54
1980	7.5
1981	7.47
1982	7.44
1983	7.41
1984	7.39
1985	7.38
1986	7.37
1987	7.35
1988	7.32
1989	7.29
1990	7.25
1991	7.19
1992	7.13
1993	7.06
1994	6.99
1995	6.92
1996	6.85
1997	6.79
1998	6.73
1999	6.68
2000	6.64
2001	6.6
2002	6.57
2003	6.54
2004	6.5
2005	6.47
2006	6.42
2007	6.37
2008	6.31
2009	6.24
2010	6.16
2011	6.08
2012	6
2013	5.92
2014	5.84
2015	5.77
2016	5.69
2017	5.62
2018	5.55