Year	Total
1800	7.8
1801	7.8
1802	7.81
1803	7.81
1804	7.81
1805	7.82
1806	7.82
1807	7.82
1808	7.83
1809	7.83
1810	7.83
1811	7.83
1812	7.84
1813	7.84
1814	7.84
1815	7.85
1816	7.85
1817	7.85
1818	7.86
1819	7.86
1820	7.86
1821	7.87
1822	7.87
1823	7.87
1824	7.88
1825	7.88
1826	7.88
1827	7.89
1828	7.89
1829	7.89
1830	7.89
1831	7.9
1832	7.9
1833	7.9
1834	7.91
1835	7.91
1836	7.91
1837	7.92
1838	7.92
1839	7.92
1840	7.93
1841	7.93
1842	7.93
1843	7.94
1844	7.94
1845	7.94
1846	7.95
1847	7.95
1848	7.95
1849	7.95
1850	7.96
1851	7.96
1852	7.96
1853	7.97
1854	7.97
1855	7.97
1856	7.98
1857	7.98
1858	7.98
1859	7.99
1860	7.99
1861	7.99
1862	8
1863	8
1864	8
1865	8.01
1866	8.01
1867	8.01
1868	8.01
1869	8.02
1870	8.02
1871	8.02
1872	8.03
1873	8.03
1874	8.03
1875	8.04
1876	8.04
1877	8.04
1878	8.05
1879	8.05
1880	8.05
1881	8.06
1882	8.06
1883	8.06
1884	8.07
1885	8.07
1886	8.07
1887	8.07
1888	8.08
1889	8.08
1890	8.08
1891	8.09
1892	8.09
1893	8.09
1894	8.1
1895	8.1
1896	8.09
1897	8.08
1898	8.07
1899	8.06
1900	8.05
1901	8.04
1902	8.03
1903	8.02
1904	8.01
1905	8
1906	7.99
1907	7.98
1908	7.97
1909	7.96
1910	7.95
1911	7.94
1912	7.93
1913	7.92
1914	7.91
1915	7.9
1916	7.89
1917	7.88
1918	7.87
1919	7.86
1920	7.85
1921	7.84
1922	7.83
1923	7.82
1924	7.81
1925	7.8
1926	7.65
1927	7.5
1928	7.34
1929	7.19
1930	7.04
1931	6.89
1932	6.74
1933	6.58
1934	6.43
1935	6.28
1936	6.13
1937	5.98
1938	5.82
1939	5.67
1940	5.52
1941	4.56
1942	3.34
1943	1.82
1944	1.74
1945	2.39
1946	3.58
1947	4.1
1948	3.63
1949	4.05
1950	4.53
1951	4.51
1952	4.49
1953	4.48
1954	4.48
1955	4.49
1956	4.51
1957	4.53
1958	4.55
1959	4.56
1960	4.55
1961	4.51
1962	4.44
1963	4.32
1964	4.16
1965	3.98
1966	3.79
1967	3.61
1968	3.45
1969	3.31
1970	3.21
1971	3.12
1972	3.03
1973	2.94
1974	2.85
1975	2.75
1976	2.65
1977	2.56
1978	2.48
1979	2.42
1980	2.39
1981	2.37
1982	2.38
1983	2.41
1984	2.44
1985	2.48
1986	2.52
1987	2.55
1988	2.57
1989	2.57
1990	2.54
1991	2.48
1992	2.4
1993	2.3
1994	2.18
1995	1.8
1996	1.8
1997	1.7
1998	1.5
1999	1.4
2000	1.3
2001	1.2
2002	1.2
2003	1.4
2004	1.4
2005	1.4
2006	1.3
2007	1.4
2008	1.4
2009	1.6
2010	1.55
2011	1.5
2012	1.73
2013	1.71
2014	1.69
2015	1.66
2016	1.63
2017	1.6
2018	1.6