Year	Total
1800	5.33
1801	5.32
1802	5.31
1803	5.3
1804	5.3
1805	5.29
1806	5.28
1807	5.28
1808	5.27
1809	5.26
1810	5.25
1811	5.25
1812	5.24
1813	5.23
1814	5.22
1815	5.22
1816	5.21
1817	5.2
1818	5.19
1819	5.19
1820	5.18
1821	5.17
1822	5.16
1823	5.16
1824	5.15
1825	5.14
1826	5.14
1827	5.14
1828	5.14
1829	5.14
1830	5.14
1831	5.14
1832	5.14
1833	5.14
1834	5.14
1835	5.14
1836	5.14
1837	5.14
1838	5.14
1839	5.14
1840	5.14
1841	5.15
1842	5.15
1843	5.15
1844	5.15
1845	5.15
1846	5.15
1847	5.15
1848	5.15
1849	5.15
1850	5.15
1851	5.14
1852	5.13
1853	5.12
1854	5.11
1855	5.11
1856	5.1
1857	5.09
1858	5.08
1859	5.07
1860	5.07
1861	5.07
1862	5.08
1863	5.09
1864	5.1
1865	5.1
1866	5.11
1867	5.12
1868	5.13
1869	5.14
1870	5.14
1871	5.14
1872	5.13
1873	5.12
1874	5.11
1875	5.1
1876	5.09
1877	5.08
1878	5.07
1879	5.07
1880	5.06
1881	5.04
1882	5.03
1883	5.02
1884	5
1885	4.99
1886	4.97
1887	4.96
1888	4.95
1889	4.93
1890	4.92
1891	4.91
1892	4.9
1893	4.9
1894	4.89
1895	4.88
1896	4.88
1897	4.87
1898	4.86
1899	4.85
1900	4.85
1901	4.76
1902	4.68
1903	4.6
1904	4.52
1905	4.44
1906	4.36
1907	4.27
1908	4.19
1909	4.11
1910	4.03
1911	3.92
1912	3.82
1913	3.71
1914	3.6
1915	3.5
1916	3.39
1917	3.28
1918	3.18
1919	3.07
1920	2.96
1921	3.04
1922	2.88
1923	2.77
1924	2.59
1925	2.48
1926	2.39
1927	2.24
1928	2.21
1929	2.12
1930	2.15
1931	2.03
1932	1.97
1933	1.83
1934	1.77
1935	1.68
1936	1.67
1937	1.69
1938	1.83
1939	1.94
1940	2.22
1941	2.27
1942	2.43
1943	2.8
1944	2.82
1945	2.69
1946	3.28
1947	3.08
1948	2.92
1949	2.77
1950	2.89
1951	2.84
1952	2.75
1953	2.66
1954	2.58
1955	2.51
1956	2.46
1957	2.41
1958	2.36
1959	2.32
1960	2.28
1961	2.24
1962	2.2
1963	2.15
1964	2.1
1965	2.05
1966	2.01
1967	1.99
1968	1.99
1969	2.02
1970	2.06
1971	2.11
1972	2.18
1973	2.24
1974	2.29
1975	2.33
1976	2.35
1977	2.34
1978	2.3
1979	2.25
1980	2.18
1981	2.11
1982	2.04
1983	1.99
1984	1.95
1985	1.93
1986	1.91
1987	1.9
1988	1.88
1989	1.85
1990	1.8
1991	1.74
1992	1.66
1993	1.58
1994	1.48
1995	1.39
1996	1.3
1997	1.22
1998	1.17
1999	1.13
2000	1.12
2001	1.14
2002	1.17
2003	1.21
2004	1.25
2005	1.3
2006	1.35
2007	1.39
2008	1.42
2009	1.45
2010	1.47
2011	1.48
2012	1.49
2013	1.5
2014	1.51
2015	1.52
2016	1.54
2017	1.56
2018	1.57