Year	Total
1800	7.2
1801	7.2
1802	7.2
1803	7.2
1804	7.2
1805	7.2
1806	7.2
1807	7.2
1808	7.2
1809	7.2
1810	7.2
1811	7.2
1812	7.2
1813	7.2
1814	7.2
1815	7.2
1816	7.2
1817	7.2
1818	7.2
1819	7.2
1820	7.2
1821	7.2
1822	7.2
1823	7.2
1824	7.2
1825	7.2
1826	7.2
1827	7.2
1828	7.2
1829	7.2
1830	7.2
1831	7.2
1832	7.2
1833	7.2
1834	7.2
1835	7.2
1836	7.2
1837	7.2
1838	7.2
1839	7.2
1840	7.2
1841	7.2
1842	7.2
1843	7.2
1844	7.2
1845	7.2
1846	7.2
1847	7.2
1848	7.2
1849	7.2
1850	7.2
1851	7.2
1852	7.2
1853	7.2
1854	7.2
1855	7.2
1856	7.2
1857	7.2
1858	7.2
1859	7.2
1860	7.2
1861	7.2
1862	7.2
1863	7.2
1864	7.2
1865	7.2
1866	7.2
1867	7.2
1868	7.2
1869	7.2
1870	7.2
1871	7.2
1872	7.2
1873	7.2
1874	7.2
1875	7.2
1876	7.2
1877	7.2
1878	7.2
1879	7.2
1880	7.2
1881	7.2
1882	7.2
1883	7.2
1884	7.2
1885	7.2
1886	7.2
1887	7.2
1888	7.2
1889	7.2
1890	7.2
1891	7.2
1892	7.2
1893	7.2
1894	7.2
1895	7.2
1896	7.2
1897	7.2
1898	7.2
1899	7.2
1900	7.2
1901	7.2
1902	7.2
1903	7.2
1904	7.2
1905	7.2
1906	7.2
1907	7.2
1908	7.2
1909	7.2
1910	7.2
1911	7.2
1912	7.2
1913	7.2
1914	7.2
1915	7.2
1916	7.2
1917	7.2
1918	7.2
1919	7.2
1920	7.2
1921	7.2
1922	7.2
1923	7.2
1924	7.2
1925	7.2
1926	7.2
1927	7.2
1928	7.2
1929	7.2
1930	7.2
1931	7.2
1932	7.2
1933	7.2
1934	7.2
1935	7.2
1936	7.19
1937	7.19
1938	7.19
1939	7.19
1940	7.19
1941	7.19
1942	7.18
1943	7.18
1944	7.18
1945	7.17
1946	7.17
1947	7.17
1948	7.16
1949	7.16
1950	7.16
1951	7.17
1952	7.19
1953	7.21
1954	7.22
1955	7.23
1956	7.23
1957	7.22
1958	7.21
1959	7.2
1960	7.2
1961	7.24
1962	7.31
1963	7.4
1964	7.52
1965	7.65
1966	7.78
1967	7.91
1968	8.01
1969	8.09
1970	8.13
1971	8.15
1972	8.14
1973	8.1
1974	8.05
1975	7.97
1976	7.87
1977	7.74
1978	7.58
1979	7.41
1980	7.22
1981	7.02
1982	6.83
1983	6.63
1984	6.44
1985	6.24
1986	6.02
1987	5.79
1988	5.53
1989	5.26
1990	4.97
1991	4.67
1992	4.38
1993	4.11
1994	3.86
1995	3.64
1996	3.44
1997	3.27
1998	3.11
1999	2.98
2000	2.86
2001	2.75
2002	2.67
2003	2.6
2004	2.54
2005	2.49
2006	2.46
2007	2.44
2008	2.43
2009	2.42
2010	2.41
2011	2.4
2012	2.39
2013	2.37
2014	2.35
2015	2.31
2016	2.27
2017	2.24
2018	2.2