Year	Total
1800	4.07
1801	4.26
1802	4.5
1803	4.45
1804	4.52
1805	4.5
1806	4.36
1807	4.42
1808	4.31
1809	3.78
1810	4.67
1811	5.01
1812	4.76
1813	4.22
1814	4.42
1815	4.93
1816	5.01
1817	4.74
1818	4.8
1819	4.68
1820	4.68
1821	5.03
1822	5.09
1823	5.22
1824	4.9
1825	5.18
1826	4.94
1827	4.44
1828	4.77
1829	4.94
1830	4.67
1831	4.32
1832	4.38
1833	4.84
1834	4.78
1835	4.63
1836	4.52
1837	4.37
1838	4.17
1839	4.18
1840	4.46
1841	4.3
1842	4.49
1843	4.36
1844	4.56
1845	4.46
1846	4.25
1847	4.2
1848	4.3
1849	4.66
1850	4.45
1851	4.36
1852	4.2
1853	4.26
1854	4.53
1855	4.3
1856	4.23
1857	4.36
1858	4.66
1859	4.71
1860	4.71
1861	4.44
1862	4.59
1863	4.65
1864	4.69
1865	4.58
1866	4.68
1867	4.4
1868	3.93
1869	4.03
1870	4.11
1871	4.37
1872	4.34
1873	4.49
1874	4.54
1875	4.6
1876	4.57
1877	4.62
1878	4.44
1879	4.56
1880	4.36
1881	4.29
1882	4.32
1883	4.24
1884	4.4
1885	4.34
1886	4.39
1887	4.36
1888	4.24
1889	4.1
1890	4.15
1891	4.14
1892	3.93
1893	3.98
1894	3.94
1895	4.01
1896	3.98
1897	3.92
1898	3.99
1899	3.9
1900	4
1901	4
1902	3.91
1903	3.78
1904	3.77
1905	3.74
1906	3.73
1907	3.7
1908	3.7
1909	3.69
1910	3.55
1911	3.45
1912	3.39
1913	3.27
1914	3.2
1915	3.01
1916	2.93
1917	2.88
1918	2.78
1919	2.69
1920	3.19
1921	2.9
1922	2.63
1923	2.52
1924	2.4
1925	2.3
1926	2.18
1927	2.07
1928	2.05
1929	1.92
1930	1.93
1931	1.85
1932	1.8
1933	1.69
1934	1.68
1935	1.68
1936	1.73
1937	1.74
1938	1.8
1939	1.86
1940	1.82
1941	1.89
1942	2.16
1943	2.38
1944	2.56
1945	2.59
1946	2.55
1947	2.49
1948	2.46
1949	2.37
1950	2.28
1951	2.21
1952	2.24
1953	2.27
1954	2.2
1955	2.27
1956	2.31
1957	2.3
1958	2.28
1959	2.26
1960	2.2
1961	2.23
1962	2.26
1963	2.33
1964	2.48
1965	2.41
1966	2.36
1967	2.27
1968	2.07
1969	1.92
1970	1.92
1971	1.96
1972	1.91
1973	1.87
1974	1.88
1975	1.77
1976	1.68
1977	1.65
1978	1.6
1979	1.66
1980	1.68
1981	1.64
1982	1.63
1983	1.61
1984	1.66
1985	1.74
1986	1.8
1987	1.84
1988	1.97
1989	2.02
1990	2.14
1991	2.11
1992	2.08
1993	1.98
1994	1.88
1995	1.73
1996	1.6
1997	1.53
1998	1.52
1999	1.51
2000	1.56
2001	1.58
2002	1.67
2003	1.73
2004	1.77
2005	1.79
2006	1.87
2007	1.89
2008	1.92
2009	1.94
2010	1.99
2011	1.9
2012	1.91
2013	1.92
2014	1.92
2015	1.91
2016	1.91
2017	1.91
2018	1.91