Year	Total
1800	5.9
1801	5.9
1802	5.9
1803	5.9
1804	5.9
1805	5.9
1806	5.9
1807	5.9
1808	5.9
1809	5.9
1810	5.9
1811	5.9
1812	5.9
1813	5.9
1814	5.9
1815	5.9
1816	5.9
1817	5.9
1818	5.9
1819	5.9
1820	5.9
1821	5.9
1822	5.9
1823	5.9
1824	5.9
1825	5.9
1826	5.9
1827	5.9
1828	5.9
1829	5.9
1830	5.9
1831	5.9
1832	5.9
1833	5.9
1834	5.9
1835	5.9
1836	5.9
1837	5.9
1838	5.9
1839	5.9
1840	5.9
1841	5.9
1842	5.9
1843	5.9
1844	5.9
1845	5.9
1846	5.9
1847	5.9
1848	5.9
1849	5.9
1850	5.9
1851	5.86
1852	5.82
1853	5.78
1854	5.73
1855	5.69
1856	5.65
1857	5.61
1858	5.57
1859	5.53
1860	5.48
1861	5.44
1862	5.4
1863	5.4
1864	5.39
1865	5.39
1866	5.38
1867	5.38
1868	5.38
1869	5.37
1870	5.37
1871	5.36
1872	5.36
1873	5.35
1874	5.35
1875	5.35
1876	5.34
1877	5.34
1878	5.33
1879	5.33
1880	5.33
1881	5.32
1882	5.32
1883	5.31
1884	5.31
1885	5.3
1886	5.3
1887	5.3
1888	5.29
1889	5.29
1890	5.28
1891	5.28
1892	5.28
1893	5.27
1894	5.27
1895	5.26
1896	5.26
1897	5.25
1898	5.25
1899	5.25
1900	5.24
1901	5.24
1902	5.23
1903	5.23
1904	5.23
1905	5.22
1906	5.22
1907	5.21
1908	5.21
1909	5.2
1910	5.2
1911	5.17
1912	5.14
1913	5.12
1914	5.09
1915	5.06
1916	5.03
1917	5
1918	4.98
1919	4.95
1920	4.92
1921	4.89
1922	4.86
1923	4.84
1924	4.81
1925	4.78
1926	4.75
1927	4.72
1928	4.7
1929	4.67
1930	4.64
1931	4.61
1932	4.59
1933	4.56
1934	4.54
1935	4.52
1936	4.5
1937	4.48
1938	4.46
1939	4.44
1940	4.42
1941	4.41
1942	4.4
1943	4.38
1944	4.37
1945	4.36
1946	4.35
1947	4.34
1948	4.33
1949	4.33
1950	4.32
1951	4.31
1952	4.24
1953	4.17
1954	4.09
1955	4.01
1956	3.92
1957	3.84
1958	3.76
1959	3.68
1960	3.6
1961	3.52
1962	3.44
1963	3.34
1964	3.25
1965	3.15
1966	3.05
1967	2.95
1968	2.87
1969	2.8
1970	2.74
1971	2.68
1972	2.62
1973	2.57
1974	2.51
1975	2.45
1976	2.39
1977	2.34
1978	2.3
1979	2.27
1980	2.24
1981	2.22
1982	2.21
1983	2.19
1984	2.18
1985	2.16
1986	2.14
1987	2.12
1988	2.1
1989	2.09
1990	2.08
1991	2.06
1992	2.05
1993	2.03
1994	2
1995	1.98
1996	1.95
1997	1.93
1998	1.91
1999	1.89
2000	1.88
2001	1.87
2002	1.86
2003	1.85
2004	1.85
2005	1.84
2006	1.83
2007	1.82
2008	1.81
2009	1.79
2010	1.77
2011	1.75
2012	1.73
2013	1.71
2014	1.69
2015	1.68
2016	1.67
2017	1.66
2018	1.65