Year	Total
1800	4.41
1801	4.36
1802	4.31
1803	4.26
1804	4.21
1805	4.16
1806	4.1
1807	4.05
1808	4
1809	3.95
1810	3.9
1811	3.89
1812	3.89
1813	3.88
1814	3.88
1815	3.87
1816	3.86
1817	3.86
1818	3.85
1819	3.85
1820	3.84
1821	3.83
1822	3.82
1823	3.8
1824	3.79
1825	3.78
1826	3.77
1827	3.76
1828	3.74
1829	3.73
1830	3.72
1831	3.7
1832	3.69
1833	3.67
1834	3.65
1835	3.64
1836	3.62
1837	3.6
1838	3.59
1839	3.57
1840	3.56
1841	3.55
1842	3.54
1843	3.53
1844	3.53
1845	3.52
1846	3.51
1847	3.51
1848	3.5
1849	3.49
1850	3.49
1851	3.45
1852	3.42
1853	3.38
1854	3.31
1855	3.24
1856	3.4
1857	3.36
1858	3.46
1859	3.61
1860	3.4
1861	3.51
1862	3.46
1863	3.53
1864	3.51
1865	3.53
1866	3.53
1867	3.55
1868	3.49
1869	3.49
1870	3.44
1871	3.08
1872	3.59
1873	3.51
1874	3.53
1875	3.51
1876	3.57
1877	3.49
1878	3.44
1879	3.44
1880	3.36
1881	3.4
1882	3.4
1883	3.38
1884	3.38
1885	3.32
1886	3.26
1887	3.22
1888	3.16
1889	3.12
1890	2.95
1891	3.03
1892	2.96
1893	3.02
1894	2.94
1895	2.86
1896	2.98
1897	2.92
1898	2.87
1899	2.88
1900	2.8
1901	2.9
1902	2.85
1903	2.78
1904	2.75
1905	2.71
1906	2.7
1907	2.58
1908	2.64
1909	2.56
1910	2.57
1911	2.46
1912	2.49
1913	2.47
1914	2.34
1915	1.52
1916	1.23
1917	1.34
1918	1.56
1919	1.59
1920	2.69
1921	2.6
1922	2.42
1923	2.41
1924	2.36
1925	2.39
1926	2.37
1927	2.29
1928	2.31
1929	2.24
1930	2.3
1931	2.25
1932	2.23
1933	2.11
1934	2.14
1935	2.07
1936	2.09
1937	2.1
1938	2.13
1939	2.17
1940	2
1941	1.85
1942	2.04
1943	2.19
1944	2.25
1945	2.31
1946	3
1947	3.04
1948	3.02
1949	3
1950	2.83
1951	2.81
1952	2.76
1953	2.72
1954	2.7
1955	2.68
1956	2.69
1957	2.7
1958	2.72
1959	2.74
1960	2.77
1961	2.8
1962	2.81
1963	2.81
1964	2.8
1965	2.77
1966	2.73
1967	2.68
1968	2.62
1969	2.56
1970	2.49
1971	2.41
1972	2.33
1973	2.24
1974	2.15
1975	2.06
1976	1.98
1977	1.92
1978	1.88
1979	1.85
1980	1.84
1981	1.84
1982	1.84
1983	1.85
1984	1.85
1985	1.84
1986	1.83
1987	1.81
1988	1.79
1989	1.77
1990	1.75
1991	1.74
1992	1.72
1993	1.72
1994	1.72
1995	1.72
1996	1.73
1997	1.75
1998	1.77
1999	1.79
2000	1.82
2001	1.84
2002	1.87
2003	1.89
2004	1.92
2005	1.94
2006	1.96
2007	1.97
2008	1.98
2009	1.99
2010	1.99
2011	1.99
2012	1.99
2013	1.98
2014	1.98
2015	1.98
2016	1.98
2017	1.98
2018	1.97