Year	Total
1800	4.44
1801	4.44
1802	4.44
1803	4.44
1804	4.44
1805	4.44
1806	4.44
1807	4.44
1808	4.44
1809	4.44
1810	4.44
1811	4.44
1812	4.44
1813	4.44
1814	4.44
1815	4.45
1816	4.46
1817	4.46
1818	4.47
1819	4.48
1820	4.49
1821	4.49
1822	4.5
1823	4.51
1824	4.52
1825	4.52
1826	4.53
1827	4.54
1828	4.55
1829	4.55
1830	4.56
1831	4.57
1832	4.58
1833	4.58
1834	4.59
1835	4.6
1836	4.61
1837	4.61
1838	4.62
1839	4.63
1840	4.64
1841	4.64
1842	4.65
1843	4.66
1844	4.67
1845	4.67
1846	4.68
1847	4.69
1848	4.7
1849	4.7
1850	4.71
1851	4.72
1852	4.73
1853	4.73
1854	4.74
1855	4.75
1856	4.76
1857	4.76
1858	4.77
1859	4.78
1860	4.79
1861	4.79
1862	4.8
1863	4.81
1864	4.82
1865	4.82
1866	4.83
1867	4.84
1868	4.85
1869	4.85
1870	4.86
1871	4.87
1872	4.88
1873	4.88
1874	4.89
1875	4.9
1876	4.91
1877	4.91
1878	4.92
1879	4.93
1880	4.94
1881	4.94
1882	4.95
1883	4.96
1884	4.89
1885	4.82
1886	4.72
1887	4.61
1888	4.5
1889	4.4
1890	4.29
1891	4.36
1892	4.43
1893	4.5
1894	4.57
1895	4.64
1896	4.69
1897	4.74
1898	4.8
1899	4.85
1900	4.9
1901	4.91
1902	4.92
1903	4.92
1904	4.93
1905	4.93
1906	4.81
1907	4.69
1908	4.57
1909	4.45
1910	4.33
1911	4.33
1912	4.33
1913	4.33
1914	4.34
1915	4.34
1916	4.34
1917	4.26
1918	4.19
1919	4.11
1920	4.03
1921	4.11
1922	4.19
1923	4.27
1924	4.36
1925	4.44
1926	4.36
1927	4.28
1928	4.2
1929	4.12
1930	4.04
1931	3.96
1932	3.89
1933	4.06
1934	4.23
1935	4.41
1936	4.31
1937	4.21
1938	4.36
1939	4.5
1940	4.65
1941	4.78
1942	4.91
1943	5.04
1944	5.16
1945	5.29
1946	5.29
1947	5.29
1948	5.28
1949	5.28
1950	5.28
1951	5.28
1952	5.29
1953	5.31
1954	5.32
1955	5.33
1956	5.34
1957	5.34
1958	5.34
1959	5.32
1960	5.26
1961	5.18
1962	5.05
1963	4.87
1964	4.66
1965	4.43
1966	4.2
1967	3.99
1968	3.8
1969	3.66
1970	3.55
1971	3.48
1972	3.43
1973	3.39
1974	3.35
1975	3.31
1976	3.29
1977	3.27
1978	3.27
1979	3.28
1980	3.28
1981	3.28
1982	3.26
1983	3.22
1984	3.15
1985	3.06
1986	2.95
1987	2.83
1988	2.7
1989	2.57
1990	2.45
1991	2.34
1992	2.23
1993	2.13
1994	2.04
1995	1.96
1996	1.9
1997	1.84
1998	1.8
1999	1.77
2000	1.75
2001	1.74
2002	1.74
2003	1.75
2004	1.76
2005	1.77
2006	1.78
2007	1.79
2008	1.8
2009	1.8
2010	1.81
2011	1.8
2012	1.8
2013	1.79
2014	1.78
2015	1.77
2016	1.75
2017	1.74
2018	1.73