Year	Total
1800	5.59
1801	5.5
1802	5.41
1803	5.32
1804	5.25
1805	5.18
1806	5.1
1807	5.03
1808	4.96
1809	4.97
1810	4.99
1811	5.01
1812	5.02
1813	5.04
1814	5.02
1815	5
1816	4.97
1817	4.95
1818	4.93
1819	4.97
1820	5.01
1821	5.05
1822	5.09
1823	5.13
1824	5.12
1825	5.11
1826	5.09
1827	5.08
1828	5.07
1829	5.03
1830	5
1831	4.96
1832	4.93
1833	4.89
1834	4.82
1835	4.75
1836	4.68
1837	4.61
1838	4.54
1839	4.51
1840	4.48
1841	4.45
1842	4.42
1843	4.4
1844	4.38
1845	4.37
1846	4.36
1847	4.34
1848	4.33
1849	4.39
1850	4.46
1851	4.52
1852	4.59
1853	4.65
1854	4.66
1855	4.68
1856	4.69
1857	4.7
1858	4.72
1859	4.82
1860	4.93
1861	5.03
1862	5.13
1863	5.24
1864	5.04
1865	4.85
1866	4.65
1867	4.46
1868	4.26
1869	4.31
1870	4.36
1871	4.41
1872	4.46
1873	4.52
1874	4.46
1875	4.4
1876	4.35
1877	4.29
1878	4.23
1879	4.2
1880	4.16
1881	4.13
1882	4.1
1883	4.06
1884	4.04
1885	4.01
1886	3.99
1887	3.96
1888	3.94
1889	3.9
1890	3.87
1891	3.84
1892	3.8
1893	3.77
1894	3.79
1895	3.82
1896	3.85
1897	3.88
1898	3.91
1899	3.89
1900	3.88
1901	3.86
1902	3.84
1903	3.82
1904	3.76
1905	3.7
1906	3.63
1907	3.57
1908	3.51
1909	3.47
1910	3.43
1911	3.38
1912	3.34
1913	3.3
1914	3.15
1915	3.01
1916	2.87
1917	2.73
1918	2.59
1919	2.58
1920	2.57
1921	2.56
1922	2.55
1923	2.54
1924	2.53
1925	2.52
1926	2.51
1927	2.47
1928	2.42
1929	2.38
1930	2.33
1931	2.29
1932	2.25
1933	2.21
1934	2.17
1935	2.13
1936	2.14
1937	2.14
1938	2.15
1939	2.15
1940	2.16
1941	2.15
1942	2.14
1943	2.14
1944	2.13
1945	2.12
1946	2.12
1947	2.11
1948	2.1
1949	2.1
1950	2.09
1951	2.08
1952	2.07
1953	2.05
1954	2.04
1955	2.02
1956	2.01
1957	1.99
1958	1.98
1959	1.96
1960	1.95
1961	1.95
1962	1.94
1963	1.95
1964	1.95
1965	1.97
1966	1.99
1967	2.01
1968	2.04
1969	2.07
1970	2.1
1971	2.12
1972	2.13
1973	2.13
1974	2.13
1975	2.11
1976	2.1
1977	2.08
1978	2.07
1979	2.06
1980	2.06
1981	2.08
1982	2.1
1983	2.13
1984	2.17
1985	2.19
1986	2.19
1987	2.17
1988	2.12
1989	2.04
1990	1.94
1991	1.83
1992	1.71
1993	1.6
1994	1.51
1995	1.43
1996	1.38
1997	1.34
1998	1.32
1999	1.31
2000	1.32
2001	1.34
2002	1.38
2003	1.43
2004	1.48
2005	1.54
2006	1.58
2007	1.62
2008	1.64
2009	1.65
2010	1.64
2011	1.63
2012	1.62
2013	1.61
2014	1.61
2015	1.62
2016	1.63
2017	1.65
2018	1.66