Year	Total
1800	5.63
1801	5.63
1802	5.64
1803	5.64
1804	5.64
1805	5.65
1806	5.65
1807	5.65
1808	5.66
1809	5.66
1810	5.66
1811	5.67
1812	5.67
1813	5.68
1814	5.68
1815	5.68
1816	5.69
1817	5.69
1818	5.69
1819	5.7
1820	5.7
1821	5.71
1822	5.71
1823	5.71
1824	5.72
1825	5.72
1826	5.72
1827	5.73
1828	5.73
1829	5.74
1830	5.74
1831	5.74
1832	5.75
1833	5.75
1834	5.75
1835	5.76
1836	5.76
1837	5.76
1838	5.77
1839	5.77
1840	5.78
1841	5.78
1842	5.78
1843	5.79
1844	5.79
1845	5.79
1846	5.8
1847	5.8
1848	5.81
1849	5.81
1850	5.81
1851	5.82
1852	5.82
1853	5.82
1854	5.83
1855	5.83
1856	5.84
1857	5.84
1858	5.84
1859	5.85
1860	5.85
1861	5.85
1862	5.86
1863	5.86
1864	5.86
1865	5.87
1866	5.87
1867	5.88
1868	5.88
1869	5.88
1870	5.89
1871	5.89
1872	5.89
1873	5.9
1874	5.9
1875	5.91
1876	5.91
1877	5.91
1878	5.92
1879	5.92
1880	5.92
1881	5.93
1882	5.93
1883	5.93
1884	5.94
1885	5.94
1886	5.95
1887	5.95
1888	5.98
1889	6.01
1890	6.04
1891	6.07
1892	6.1
1893	6.03
1894	5.97
1895	5.9
1896	5.84
1897	5.78
1898	5.74
1899	5.71
1900	5.67
1901	5.64
1902	5.6
1903	5.65
1904	5.7
1905	5.75
1906	5.79
1907	5.84
1908	5.87
1909	5.89
1910	5.91
1911	5.94
1912	5.96
1913	5.88
1914	5.8
1915	5.71
1916	5.63
1917	5.55
1918	5.54
1919	5.54
1920	5.53
1921	5.53
1922	5.52
1923	5.57
1924	5.62
1925	5.67
1926	5.72
1927	5.78
1928	5.69
1929	5.6
1930	5.52
1931	5.43
1932	5.35
1933	5.35
1934	5.36
1935	5.37
1936	5.38
1937	5.39
1938	5.42
1939	5.46
1940	5.49
1941	5.53
1942	5.56
1943	5.62
1944	5.67
1945	5.73
1946	5.79
1947	5.84
1948	6.08
1949	6.31
1950	6.54
1951	6.51
1952	6.46
1953	6.43
1954	6.41
1955	6.42
1956	6.44
1957	6.48
1958	6.53
1959	6.58
1960	6.62
1961	6.64
1962	6.63
1963	6.58
1964	6.5
1965	6.37
1966	6.2
1967	6.01
1968	5.81
1969	5.61
1970	5.4
1971	5.22
1972	5.05
1973	4.91
1974	4.78
1975	4.67
1976	4.57
1977	4.48
1978	4.39
1979	4.3
1980	4.2
1981	4.1
1982	4.01
1983	3.93
1984	3.86
1985	3.79
1986	3.73
1987	3.67
1988	3.6
1989	3.52
1990	3.45
1991	3.37
1992	3.29
1993	3.22
1994	3.15
1995	3.08
1996	3.02
1997	2.97
1998	2.92
1999	2.87
2000	2.82
2001	2.78
2002	2.74
2003	2.7
2004	2.66
2005	2.63
2006	2.6
2007	2.56
2008	2.53
2009	2.5
2010	2.47
2011	2.44
2012	2.42
2013	2.39
2014	2.37
2015	2.34
2016	2.32
2017	2.29
2018	2.27