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	5.9
1852	5.9
1853	5.9
1854	5.9
1855	5.9
1856	5.9
1857	5.9
1858	5.9
1859	5.9
1860	5.9
1861	5.9
1862	5.9
1863	5.9
1864	5.9
1865	5.9
1866	5.9
1867	5.9
1868	5.9
1869	5.9
1870	5.9
1871	5.9
1872	5.9
1873	5.9
1874	5.9
1875	5.9
1876	5.9
1877	5.9
1878	5.9
1879	5.9
1880	5.9
1881	5.9
1882	5.9
1883	5.9
1884	5.9
1885	5.9
1886	5.9
1887	5.9
1888	5.9
1889	5.9
1890	5.9
1891	5.9
1892	5.9
1893	5.9
1894	5.9
1895	5.9
1896	5.9
1897	5.9
1898	5.9
1899	5.9
1900	5.9
1901	5.9
1902	5.9
1903	5.9
1904	5.9
1905	5.9
1906	5.9
1907	5.9
1908	5.9
1909	5.9
1910	5.9
1911	5.9
1912	5.9
1913	5.9
1914	5.9
1915	5.9
1916	5.9
1917	5.9
1918	5.9
1919	5.9
1920	5.9
1921	5.9
1922	5.9
1923	5.9
1924	5.9
1925	5.9
1926	5.82
1927	5.75
1928	5.67
1929	5.59
1930	5.52
1931	5.44
1932	5.36
1933	5.28
1934	5.21
1935	5.13
1936	5.05
1937	4.98
1938	4.9
1939	4.82
1940	4.75
1941	4.67
1942	4.59
1943	4.52
1944	4.44
1945	4.36
1946	4.29
1947	4.21
1948	4.13
1949	4.05
1950	3.98
1951	3.99
1952	4.02
1953	4.06
1954	4.12
1955	4.18
1956	4.25
1957	4.32
1958	4.4
1959	4.46
1960	4.5
1961	4.5
1962	4.45
1963	4.36
1964	4.22
1965	4.06
1966	3.89
1967	3.75
1968	3.64
1969	3.57
1970	3.53
1971	3.5
1972	3.47
1973	3.41
1974	3.33
1975	3.23
1976	3.14
1977	3.06
1978	3.01
1979	2.99
1980	2.99
1981	2.99
1982	2.99
1983	2.97
1984	2.92
1985	2.86
1986	2.79
1987	2.73
1988	2.68
1989	2.65
1990	2.64
1991	2.63
1992	2.62
1993	2.6
1994	2.57
1995	2.51
1996	2.44
1997	2.36
1998	2.26
1999	2.17
2000	2.07
2001	1.99
2002	1.93
2003	1.89
2004	1.86
2005	1.86
2006	1.87
2007	1.87
2008	1.88
2009	1.88
2010	1.87
2011	1.85
2012	1.83
2013	1.81
2014	1.79
2015	1.78
2016	1.77
2017	1.76
2018	1.75