Year	Total
1800	4.93
1801	4.92
1802	4.91
1803	4.9
1804	4.89
1805	4.88
1806	4.87
1807	4.86
1808	4.85
1809	4.84
1810	4.82
1811	4.81
1812	4.8
1813	4.79
1814	4.78
1815	4.77
1816	4.76
1817	4.75
1818	4.74
1819	4.73
1820	4.72
1821	4.71
1822	4.7
1823	4.69
1824	4.68
1825	4.67
1826	4.66
1827	4.65
1828	4.63
1829	4.62
1830	4.61
1831	4.6
1832	4.59
1833	4.58
1834	4.57
1835	4.56
1836	4.55
1837	4.54
1838	4.53
1839	4.52
1840	4.51
1841	4.5
1842	4.49
1843	4.48
1844	4.47
1845	4.46
1846	4.44
1847	4.43
1848	4.42
1849	4.41
1850	4.4
1851	4.39
1852	4.38
1853	4.37
1854	4.36
1855	4.35
1856	4.34
1857	4.33
1858	4.21
1859	4.45
1860	3.93
1861	4.25
1862	4.12
1863	4.32
1864	4.25
1865	4.23
1866	4.32
1867	4.2
1868	4.47
1869	4.55
1870	4.59
1871	4.43
1872	4.32
1873	4.55
1874	4.42
1875	4.51
1876	4.64
1877	4.38
1878	4.3
1879	4.41
1880	4.55
1881	4.45
1882	4.51
1883	4.54
1884	4.64
1885	4.59
1886	4.68
1887	4.64
1888	4.59
1889	4.63
1890	4.26
1891	4.59
1892	4.45
1893	4.49
1894	4.49
1895	4.63
1896	4.56
1897	4.6
1898	4.45
1899	4.49
1900	4.49
1901	4.5
1902	4.58
1903	4.41
1904	4.46
1905	4.36
1906	4.39
1907	4.26
1908	4.32
1909	4.43
1910	4.36
1911	4.12
1912	4
1913	4.06
1914	3.9
1915	3.12
1916	2.34
1917	2.34
1918	2.34
1919	2.95
1920	3.54
1921	3.95
1922	3.9
1923	4.02
1924	3.94
1925	3.84
1926	3.69
1927	3.63
1928	3.56
1929	3.34
1930	3.61
1931	3.45
1932	3.43
1933	3.2
1934	3.06
1935	2.95
1936	2.96
1937	2.85
1938	2.82
1939	2.82
1940	2.84
1941	2.92
1942	2.78
1943	2.86
1944	2.51
1945	1.88
1946	2.66
1947	2.89
1948	2.89
1949	3.03
1950	2.8
1951	2.75
1952	2.67
1953	2.59
1954	2.53
1955	2.47
1956	2.43
1957	2.39
1958	2.37
1959	2.35
1960	2.34
1961	2.33
1962	2.33
1963	2.32
1964	2.31
1965	2.3
1966	2.29
1967	2.27
1968	2.26
1969	2.24
1970	2.23
1971	2.22
1972	2.21
1973	2.21
1974	2.2
1975	2.2
1976	2.18
1977	2.17
1978	2.14
1979	2.11
1980	2.06
1981	2.02
1982	1.96
1983	1.91
1984	1.85
1985	1.8
1986	1.74
1987	1.67
1988	1.61
1989	1.54
1990	1.48
1991	1.42
1992	1.37
1993	1.33
1994	1.29
1995	1.27
1996	1.25
1997	1.24
1998	1.22
1999	1.21
2000	1.21
2001	1.21
2002	1.22
2003	1.24
2004	1.27
2005	1.31
2006	1.36
2007	1.4
2008	1.44
2009	1.48
2010	1.52
2011	1.54
2012	1.57
2013	1.58
2014	1.6
2015	1.61
2016	1.63
2017	1.64
2018	1.65