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	5.74
1855	5.7
1856	5.66
1857	5.62
1858	5.58
1859	5.55
1860	5.51
1861	5.47
1862	5.43
1863	5.7
1864	5.96
1865	5.97
1866	5.98
1867	5.98
1868	5.99
1869	6
1870	6
1871	5.95
1872	5.89
1873	5.84
1874	5.78
1875	5.73
1876	5.67
1877	5.62
1878	5.56
1879	5.51
1880	5.45
1881	5.45
1882	5.44
1883	5.44
1884	5.43
1885	5.43
1886	5.42
1887	5.42
1888	5.41
1889	5.41
1890	5.4
1891	5.43
1892	5.46
1893	5.48
1894	5.51
1895	5.54
1896	5.57
1897	5.6
1898	5.63
1899	5.65
1900	5.68
1901	5.54
1902	5.41
1903	5.27
1904	5.13
1905	5
1906	5.04
1907	5.09
1908	5.13
1909	5.18
1910	5.23
1911	5.18
1912	5.14
1913	5.1
1914	5.05
1915	5.01
1916	4.96
1917	4.92
1918	4.88
1919	4.83
1920	4.79
1921	4.75
1922	4.7
1923	4.66
1924	4.62
1925	4.57
1926	4.53
1927	4.49
1928	4.44
1929	4.4
1930	4.36
1931	4.31
1932	4.27
1933	4.22
1934	4.18
1935	4.14
1936	4.09
1937	4.05
1938	4.01
1939	3.96
1940	3.92
1941	3.88
1942	3.85
1943	3.81
1944	3.78
1945	3.74
1946	3.71
1947	3.68
1948	3.65
1949	3.62
1950	3.59
1951	3.49
1952	3.29
1953	3.11
1954	2.96
1955	2.82
1956	2.71
1957	2.63
1958	2.56
1959	2.52
1960	2.49
1961	2.49
1962	2.48
1963	2.48
1964	2.48
1965	2.47
1966	2.45
1967	2.44
1968	2.42
1969	2.4
1970	2.39
1971	2.38
1972	2.37
1973	2.36
1974	2.36
1975	2.36
1976	2.37
1977	2.37
1978	2.36
1979	2.36
1980	2.35
1981	2.34
1982	2.33
1983	2.32
1984	2.31
1985	2.29
1986	2.27
1987	2.24
1988	2.2
1989	2.15
1990	2.1
1991	2.05
1992	2
1993	1.95
1994	1.92
1995	1.89
1996	1.86
1997	1.84
1998	1.82
1999	1.79
2000	1.77
2001	1.74
2002	1.72
2003	1.69
2004	1.66
2005	1.64
2006	1.61
2007	1.6
2008	1.58
2009	1.58
2010	1.58
2011	1.58
2012	1.58
2013	1.59
2014	1.6
2015	1.6
2016	1.61
2017	1.62
2018	1.62