Year	Total
1800	5.4
1801	5.4
1802	5.39
1803	5.39
1804	5.38
1805	5.38
1806	5.37
1807	5.37
1808	5.36
1809	5.36
1810	5.35
1811	5.35
1812	5.34
1813	5.34
1814	5.33
1815	5.33
1816	5.32
1817	5.32
1818	5.33
1819	5.35
1820	5.37
1821	5.35
1822	5.33
1823	5.31
1824	5.28
1825	5.26
1826	5.17
1827	5.07
1828	4.97
1829	4.88
1830	4.78
1831	4.8
1832	4.83
1833	4.85
1834	4.88
1835	4.9
1836	4.9
1837	4.9
1838	4.9
1839	4.9
1840	4.9
1841	4.92
1842	4.95
1843	4.97
1844	5
1845	5.02
1846	5.02
1847	5.02
1848	5.01
1849	5.01
1850	5.01
1851	4.87
1852	4.74
1853	4.6
1854	4.47
1855	4.33
1856	4.45
1857	4.56
1858	4.67
1859	4.79
1860	4.9
1861	4.93
1862	4.96
1863	5
1864	5.03
1865	5.06
1866	5.09
1867	5.11
1868	5.13
1869	5.16
1870	5.18
1871	5.24
1872	5.3
1873	5.35
1874	5.41
1875	5.46
1876	5.38
1877	5.3
1878	5.22
1879	5.14
1880	5.06
1881	5.14
1882	5.21
1883	5.29
1884	5.28
1885	5.26
1886	5.25
1887	5.23
1888	5.22
1889	5.21
1890	5.2
1891	5.18
1892	5.17
1893	5.16
1894	5.14
1895	5.11
1896	5.09
1897	5.06
1898	5.04
1899	4.99
1900	4.93
1901	4.88
1902	4.82
1903	4.77
1904	4.68
1905	4.6
1906	4.51
1907	4.43
1908	4.34
1909	4.18
1910	4.01
1911	3.85
1912	3.68
1913	3.52
1914	3.27
1915	3.02
1916	2.76
1917	2.51
1918	2.26
1919	2.33
1920	2.4
1921	2.48
1922	2.55
1923	2.62
1924	2.42
1925	2.21
1926	2.1
1927	1.98
1928	1.99
1929	1.93
1930	1.88
1931	1.71
1932	1.62
1933	1.58
1934	1.93
1935	2.03
1936	2.07
1937	2.09
1938	2.25
1939	2.39
1940	2.4
1941	2.25
1942	1.83
1943	2
1944	1.89
1945	1.53
1946	2.01
1947	2.04
1948	2.1
1949	2.16
1950	2.08
1951	2.09
1952	2.11
1953	2.14
1954	2.17
1955	2.2
1956	2.23
1957	2.27
1958	2.31
1959	2.35
1960	2.4
1961	2.43
1962	2.47
1963	2.49
1964	2.5
1965	2.48
1966	2.44
1967	2.37
1968	2.28
1969	2.17
1970	2.04
1971	1.92
1972	1.8
1973	1.7
1974	1.62
1975	1.56
1976	1.53
1977	1.5
1978	1.49
1979	1.48
1980	1.47
1981	1.47
1982	1.46
1983	1.46
1984	1.46
1985	1.45
1986	1.44
1987	1.43
1988	1.41
1989	1.38
1990	1.36
1991	1.34
1992	1.32
1993	1.31
1994	1.31
1995	1.31
1996	1.32
1997	1.33
1998	1.34
1999	1.35
2000	1.35
2001	1.35
2002	1.35
2003	1.35
2004	1.35
2005	1.35
2006	1.36
2007	1.36
2008	1.37
2009	1.38
2010	1.39
2011	1.41
2012	1.42
2013	1.43
2014	1.44
2015	1.45
2016	1.46
2017	1.47
2018	1.48