Year	Total
1800	6.5
1801	6.5
1802	6.49
1803	6.49
1804	6.49
1805	6.48
1806	6.48
1807	6.47
1808	6.47
1809	6.47
1810	6.46
1811	6.46
1812	6.46
1813	6.45
1814	6.45
1815	6.44
1816	6.44
1817	6.44
1818	6.43
1819	6.43
1820	6.43
1821	6.42
1822	6.42
1823	6.41
1824	6.41
1825	6.41
1826	6.4
1827	6.4
1828	6.4
1829	6.39
1830	6.39
1831	6.38
1832	6.38
1833	6.38
1834	6.37
1835	6.37
1836	6.37
1837	6.36
1838	6.36
1839	6.35
1840	6.35
1841	6.35
1842	6.34
1843	6.34
1844	6.34
1845	6.33
1846	6.33
1847	6.32
1848	6.32
1849	6.32
1850	6.31
1851	6.31
1852	6.31
1853	6.3
1854	6.3
1855	6.29
1856	6.29
1857	6.29
1858	6.28
1859	6.28
1860	6.28
1861	6.27
1862	6.27
1863	6.26
1864	6.26
1865	6.26
1866	6.25
1867	6.25
1868	6.25
1869	6.24
1870	6.24
1871	6.23
1872	6.23
1873	6.23
1874	6.22
1875	6.22
1876	6.22
1877	6.21
1878	6.21
1879	6.2
1880	6.2
1881	6.19
1882	6.18
1883	6.17
1884	6.16
1885	6.14
1886	6.13
1887	6.12
1888	6.11
1889	6.1
1890	6.09
1891	6.08
1892	6.07
1893	6.06
1894	6.04
1895	6.03
1896	6.02
1897	6.01
1898	6
1899	5.99
1900	5.98
1901	5.97
1902	5.96
1903	5.94
1904	5.93
1905	5.92
1906	5.91
1907	5.9
1908	5.89
1909	5.88
1910	5.87
1911	5.86
1912	5.84
1913	5.83
1914	5.82
1915	5.81
1916	5.8
1917	5.79
1918	5.78
1919	5.77
1920	5.76
1921	5.74
1922	5.73
1923	5.72
1924	5.71
1925	5.7
1926	5.7
1927	5.7
1928	5.7
1929	5.7
1930	5.7
1931	5.69
1932	5.67
1933	5.66
1934	5.64
1935	5.62
1936	5.6
1937	5.58
1938	5.56
1939	5.53
1940	5.51
1941	5.48
1942	5.45
1943	5.42
1944	5.38
1945	5.35
1946	5.31
1947	5.28
1948	5.24
1949	5.2
1950	5.15
1951	5.11
1952	5.07
1953	5.04
1954	5
1955	4.97
1956	4.95
1957	4.93
1958	4.92
1959	4.91
1960	4.91
1961	4.94
1962	4.97
1963	5.01
1964	5.04
1965	5.08
1966	5.11
1967	5.14
1968	5.18
1969	5.21
1970	5.25
1971	5.28
1972	5.33
1973	5.37
1974	5.42
1975	5.47
1976	5.52
1977	5.57
1978	5.62
1979	5.66
1980	5.69
1981	5.71
1982	5.72
1983	5.72
1984	5.71
1985	5.69
1986	5.65
1987	5.61
1988	5.55
1989	5.49
1990	5.42
1991	5.35
1992	5.26
1993	5.18
1994	5.09
1995	5
1996	4.9
1997	4.81
1998	4.72
1999	4.63
2000	4.54
2001	4.46
2002	4.39
2003	4.33
2004	4.27
2005	4.23
2006	4.19
2007	4.16
2008	4.14
2009	4.11
2010	4.08
2011	4.05
2012	4.01
2013	3.96
2014	3.91
2015	3.85
2016	3.79
2017	3.72
2018	3.66