Year	Total
1800	6.8
1801	6.8
1802	6.8
1803	6.8
1804	6.8
1805	6.8
1806	6.8
1807	6.8
1808	6.8
1809	6.8
1810	6.8
1811	6.8
1812	6.8
1813	6.8
1814	6.8
1815	6.8
1816	6.8
1817	6.8
1818	6.8
1819	6.8
1820	6.8
1821	6.8
1822	6.8
1823	6.8
1824	6.8
1825	6.8
1826	6.8
1827	6.8
1828	6.8
1829	6.8
1830	6.8
1831	6.8
1832	6.8
1833	6.8
1834	6.8
1835	6.8
1836	6.8
1837	6.8
1838	6.8
1839	6.8
1840	6.8
1841	6.8
1842	6.8
1843	6.8
1844	6.8
1845	6.8
1846	6.8
1847	6.8
1848	6.8
1849	6.8
1850	6.8
1851	6.8
1852	6.8
1853	6.8
1854	6.8
1855	6.8
1856	6.8
1857	6.8
1858	6.8
1859	6.8
1860	6.8
1861	6.8
1862	6.8
1863	6.8
1864	6.8
1865	6.8
1866	6.8
1867	6.8
1868	6.8
1869	6.8
1870	6.73
1871	6.65
1872	6.58
1873	6.58
1874	6.57
1875	6.57
1876	6.57
1877	6.57
1878	6.56
1879	6.56
1880	6.56
1881	6.56
1882	6.55
1883	6.47
1884	6.39
1885	6.3
1886	6.22
1887	6.14
1888	6.09
1889	6.04
1890	5.99
1891	5.94
1892	5.9
1893	6.26
1894	6.63
1895	7
1896	6.48
1897	5.96
1898	5.96
1899	5.95
1900	5.95
1901	5.94
1902	5.94
1903	5.88
1904	5.82
1905	5.76
1906	5.7
1907	5.64
1908	5.56
1909	5.49
1910	5.41
1911	5.33
1912	5.25
1913	5.28
1914	5.3
1915	5.23
1916	5.15
1917	5.08
1918	5.01
1919	4.94
1920	4.86
1921	4.79
1922	4.72
1923	4.65
1924	4.57
1925	4.5
1926	4.43
1927	4.36
1928	4.26
1929	4.17
1930	4.07
1931	3.98
1932	3.89
1933	3.8
1934	3.71
1935	3.62
1936	3.53
1937	3.44
1938	3.44
1939	3.43
1940	3.43
1941	3.42
1942	3.42
1943	3.37
1944	3.33
1945	3.29
1946	3.24
1947	3.2
1948	3.19
1949	3.18
1950	3.16
1951	3.16
1952	3.16
1953	3.15
1954	3.15
1955	3.14
1956	3.14
1957	3.13
1958	3.12
1959	3.12
1960	3.11
1961	3.1
1962	3.09
1963	3.08
1964	3.07
1965	3.06
1966	3.05
1967	3.05
1968	3.05
1969	3.06
1970	3.07
1971	3.1
1972	3.15
1973	3.2
1974	3.26
1975	3.32
1976	3.37
1977	3.39
1978	3.39
1979	3.37
1980	3.33
1981	3.27
1982	3.21
1983	3.16
1984	3.12
1985	3.09
1986	3.07
1987	3.06
1988	3.04
1989	3.02
1990	2.99
1991	2.95
1992	2.91
1993	2.87
1994	2.82
1995	2.76
1996	2.71
1997	2.66
1998	2.62
1999	2.59
2000	2.56
2001	2.54
2002	2.52
2003	2.5
2004	2.47
2005	2.45
2006	2.43
2007	2.41
2008	2.4
2009	2.38
2010	2.37
2011	2.36
2012	2.35
2013	2.34
2014	2.32
2015	2.31
2016	2.29
2017	2.28
2018	2.26