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	5.2
1912	5.17
1913	5.14
1914	5.11
1915	5.08
1916	5.06
1917	5.03
1918	5
1919	4.97
1920	4.94
1921	4.91
1922	4.89
1923	4.86
1924	4.83
1925	4.8
1926	4.77
1927	4.74
1928	4.72
1929	4.69
1930	4.66
1931	4.63
1932	4.61
1933	4.59
1934	4.57
1935	4.56
1936	4.55
1937	4.54
1938	4.54
1939	4.54
1940	4.54
1941	4.55
1942	4.56
1943	4.57
1944	4.59
1945	4.6
1946	4.62
1947	4.64
1948	4.67
1949	4.7
1950	4.73
1951	4.72
1952	4.64
1953	4.54
1954	4.45
1955	4.35
1956	4.24
1957	4.14
1958	4.03
1959	3.93
1960	3.84
1961	3.76
1962	3.69
1963	3.64
1964	3.6
1965	3.55
1966	3.5
1967	3.44
1968	3.36
1969	3.27
1970	3.16
1971	3.04
1972	2.93
1973	2.83
1974	2.74
1975	2.66
1976	2.61
1977	2.56
1978	2.53
1979	2.51
1980	2.49
1981	2.47
1982	2.45
1983	2.43
1984	2.4
1985	2.37
1986	2.34
1987	2.3
1988	2.27
1989	2.24
1990	2.21
1991	2.17
1992	2.13
1993	2.09
1994	2.03
1995	1.98
1996	1.92
1997	1.86
1998	1.81
1999	1.77
2000	1.72
2001	1.68
2002	1.64
2003	1.61
2004	1.57
2005	1.53
2006	1.5
2007	1.48
2008	1.47
2009	1.46
2010	1.47
2011	1.47
2012	1.49
2013	1.5
2014	1.51
2015	1.52
2016	1.53
2017	1.54
2018	1.55