Year	Total
1800	6.05
1801	6.05
1802	6.05
1803	6.06
1804	6.06
1805	6.06
1806	6.06
1807	6.07
1808	6.07
1809	6.07
1810	6.07
1811	6.07
1812	6.08
1813	6.08
1814	6.08
1815	6.08
1816	6.08
1817	6.09
1818	6.09
1819	6.09
1820	6.09
1821	6.1
1822	6.1
1823	6.1
1824	6.1
1825	6.1
1826	6.11
1827	6.11
1828	6.11
1829	6.11
1830	6.12
1831	6.12
1832	6.12
1833	6.12
1834	6.12
1835	6.13
1836	6.13
1837	6.13
1838	6.13
1839	6.13
1840	6.14
1841	6.14
1842	6.14
1843	6.14
1844	6.15
1845	6.15
1846	6.15
1847	6.15
1848	6.15
1849	6.16
1850	6.16
1851	6.16
1852	6.16
1853	6.16
1854	6.17
1855	6.17
1856	6.17
1857	6.17
1858	6.18
1859	6.18
1860	6.18
1861	6.18
1862	6.18
1863	6.19
1864	6.19
1865	6.19
1866	6.19
1867	6.2
1868	6.2
1869	6.2
1870	6.2
1871	6.2
1872	6.21
1873	6.21
1874	6.21
1875	6.21
1876	6.21
1877	6.22
1878	6.22
1879	6.22
1880	6.22
1881	6.23
1882	6.23
1883	6.23
1884	6.23
1885	6.23
1886	6.24
1887	6.24
1888	6.24
1889	6.24
1890	6.25
1891	6.25
1892	6.25
1893	6.25
1894	6.25
1895	6.26
1896	6.26
1897	6.26
1898	6.26
1899	6.26
1900	6.27
1901	6.27
1902	6.27
1903	6.27
1904	6.28
1905	6.28
1906	6.28
1907	6.28
1908	6.28
1909	6.29
1910	6.29
1911	6.29
1912	6.29
1913	6.24
1914	6.18
1915	6.12
1916	6.06
1917	6
1918	6.08
1919	6.15
1920	6.23
1921	6.3
1922	6.38
1923	6.37
1924	6.37
1925	6.36
1926	6.36
1927	6.35
1928	6.29
1929	6.23
1930	6.17
1931	6.11
1932	6.05
1933	6.05
1934	6.04
1935	6.04
1936	6.04
1937	6.03
1938	6.09
1939	6.14
1940	6.2
1941	6.25
1942	6.31
1943	6.33
1944	6.35
1945	6.37
1946	6.39
1947	6.41
1948	6.76
1949	7.12
1950	7.47
1951	7.48
1952	7.5
1953	7.51
1954	7.51
1955	7.51
1956	7.51
1957	7.5
1958	7.49
1959	7.47
1960	7.46
1961	7.45
1962	7.44
1963	7.44
1964	7.44
1965	7.44
1966	7.44
1967	7.42
1968	7.38
1969	7.33
1970	7.27
1971	7.2
1972	7.11
1973	7.03
1974	6.94
1975	6.84
1976	6.75
1977	6.65
1978	6.54
1979	6.43
1980	6.31
1981	6.19
1982	6.06
1983	5.93
1984	5.8
1985	5.67
1986	5.55
1987	5.44
1988	5.33
1989	5.23
1990	5.14
1991	5.05
1992	4.95
1993	4.85
1994	4.75
1995	4.64
1996	4.53
1997	4.41
1998	4.29
1999	4.17
2000	4.06
2001	3.94
2002	3.82
2003	3.69
2004	3.57
2005	3.45
2006	3.33
2007	3.2
2008	3.09
2009	2.98
2010	2.87
2011	2.78
2012	2.69
2013	2.62
2014	2.56
2015	2.51
2016	2.46
2017	2.42
2018	2.39