Year	Total
1800	5.2
1801	5.19
1802	5.18
1803	5.18
1804	5.17
1805	5.16
1806	5.15
1807	5.14
1808	5.14
1809	5.13
1810	5.12
1811	5.11
1812	5.1
1813	5.1
1814	5.09
1815	5.08
1816	5.07
1817	5.06
1818	5.06
1819	5.05
1820	5.04
1821	5.03
1822	5.02
1823	5.02
1824	5.01
1825	5
1826	4.99
1827	4.98
1828	4.98
1829	4.97
1830	4.96
1831	4.95
1832	4.94
1833	4.94
1834	4.93
1835	4.92
1836	4.91
1837	4.9
1838	4.9
1839	4.89
1840	4.88
1841	4.87
1842	4.86
1843	4.86
1844	4.85
1845	4.84
1846	4.83
1847	4.82
1848	4.82
1849	4.81
1850	4.8
1851	4.77
1852	4.75
1853	4.72
1854	4.69
1855	4.67
1856	4.64
1857	4.61
1858	4.59
1859	4.56
1860	4.54
1861	4.51
1862	4.48
1863	4.46
1864	4.43
1865	4.4
1866	4.38
1867	4.35
1868	4.32
1869	4.3
1870	4.27
1871	4.24
1872	4.22
1873	4.19
1874	4.17
1875	4.14
1876	4.11
1877	4.09
1878	4.06
1879	4.03
1880	4.01
1881	3.98
1882	3.95
1883	3.93
1884	3.9
1885	3.87
1886	3.85
1887	3.82
1888	3.8
1889	3.77
1890	3.74
1891	3.72
1892	3.69
1893	3.66
1894	3.64
1895	3.61
1896	3.58
1897	3.56
1898	3.54
1899	3.52
1900	3.5
1901	3.47
1902	3.45
1903	3.43
1904	3.41
1905	3.39
1906	3.37
1907	3.35
1908	3.33
1909	3.31
1910	3.29
1911	3.27
1912	3.25
1913	3.22
1914	3.2
1915	3.18
1916	3.16
1917	3.14
1918	3.12
1919	3.1
1920	3.08
1921	3.06
1922	3.04
1923	3.02
1924	3
1925	2.97
1926	2.91
1927	2.85
1928	2.78
1929	2.72
1930	2.65
1931	2.59
1932	2.54
1933	2.48
1934	2.42
1935	2.36
1936	2.38
1937	2.41
1938	2.44
1939	2.46
1940	2.49
1941	2.44
1942	2.39
1943	2.35
1944	2.3
1945	2.25
1946	2.2
1947	2.15
1948	2.11
1949	2.06
1950	2.01
1951	2.01
1952	2
1953	2
1954	1.99
1955	1.98
1956	1.97
1957	1.96
1958	1.94
1959	1.93
1960	1.91
1961	1.9
1962	1.88
1963	1.86
1964	1.85
1965	1.84
1966	1.84
1967	1.85
1968	1.87
1969	1.9
1970	1.93
1971	1.95
1972	1.96
1973	1.97
1974	1.96
1975	1.95
1976	1.93
1977	1.92
1978	1.91
1979	1.92
1980	1.94
1981	1.98
1982	2.02
1983	2.07
1984	2.11
1985	2.15
1986	2.16
1987	2.14
1988	2.1
1989	2.03
1990	1.94
1991	1.83
1992	1.7
1993	1.58
1994	1.46
1995	1.36
1996	1.27
1997	1.22
1998	1.18
1999	1.17
2000	1.18
2001	1.21
2002	1.25
2003	1.3
2004	1.35
2005	1.4
2006	1.43
2007	1.46
2008	1.49
2009	1.5
2010	1.51
2011	1.51
2012	1.51
2013	1.51
2014	1.52
2015	1.53
2016	1.54
2017	1.56
2018	1.57