Year	Total
1800	4.32
1801	4.07
1802	3.91
1803	4.2
1804	3.94
1805	4.33
1806	4.39
1807	4.27
1808	4
1809	3.21
1810	3.87
1811	3.99
1812	4.26
1813	3.76
1814	3.53
1815	4.4
1816	5.05
1817	4.67
1818	4.43
1819	4.59
1820	4.79
1821	5
1822	4.74
1823	4.88
1824	4.67
1825	4.94
1826	5.01
1827	4.61
1828	4.58
1829	4.84
1830	4.65
1831	4.46
1832	4.3
1833	4.42
1834	4.56
1835	4.7
1836	4.23
1837	4.13
1838	4.36
1839	3.84
1840	4.01
1841	4.29
1842	4.42
1843	4.34
1844	4.31
1845	4.49
1846	4.4
1847	4.43
1848	4.28
1849	4.61
1850	4.45
1851	4.6
1852	4.46
1853	4.6
1854	4.93
1855	4.61
1856	4.42
1857	4.54
1858	4.62
1859	4.82
1860	4.63
1861	4.3
1862	4.52
1863	4.69
1864	4.55
1865	4.6
1866	4.61
1867	4.38
1868	4.3
1869	4.22
1870	4.26
1871	4.29
1872	4.4
1873	4.41
1874	4.59
1875	4.67
1876	4.68
1877	4.69
1878	4.64
1879	4.71
1880	4.53
1881	4.4
1882	4.47
1883	4.51
1884	4.59
1885	4.56
1886	4.48
1887	4.56
1888	4.42
1889	4.31
1890	4.43
1891	4.51
1892	4.35
1893	4.47
1894	4.38
1895	4.52
1896	4.47
1897	4.48
1898	4.53
1899	4.47
1900	4.4
1901	4.37
1902	4.26
1903	4.16
1904	4.07
1905	3.95
1906	3.92
1907	3.87
1908	3.87
1909	3.96
1910	3.82
1911	3.8
1912	3.72
1913	3.64
1914	3.62
1915	3.37
1916	3.43
1917	3.53
1918	3.44
1919	3.17
1920	3.61
1921	3.31
1922	3.18
1923	3.09
1924	2.85
1925	2.61
1926	2.59
1927	2.38
1928	2.34
1929	2.23
1930	2.19
1931	2.08
1932	2.04
1933	1.86
1934	1.82
1935	1.78
1936	1.8
1937	1.84
1938	1.88
1939	1.91
1940	1.95
1941	1.83
1942	2.11
1943	2.26
1944	2.45
1945	2.43
1946	2.77
1947	2.66
1948	2.6
1949	2.52
1950	2.52
1951	2.48
1952	2.61
1953	2.66
1954	2.7
1955	2.79
1956	2.86
1957	2.86
1958	2.89
1959	2.91
1960	2.88
1961	2.91
1962	2.89
1963	2.91
1964	2.96
1965	2.93
1966	2.89
1967	2.8
1968	2.75
1969	2.69
1970	2.5
1971	2.49
1972	2.38
1973	2.23
1974	2.13
1975	1.98
1976	1.86
1977	1.75
1978	1.77
1979	1.75
1980	1.72
1981	1.7
1982	1.71
1983	1.66
1984	1.66
1985	1.68
1986	1.71
1987	1.75
1988	1.84
1989	1.89
1990	1.93
1991	1.92
1992	1.88
1993	1.86
1994	1.87
1995	1.87
1996	1.89
1997	1.86
1998	1.81
1999	1.85
2000	1.85
2001	1.78
2002	1.75
2003	1.8
2004	1.83
2005	1.84
2006	1.9
2007	1.9
2008	1.96
2009	1.98
2010	1.95
2011	1.88
2012	1.85
2013	1.91
2014	1.87
2015	1.84
2016	1.82
2017	1.82
2018	1.83