Year	Total
1800	7
1801	7
1802	7
1803	7
1804	7
1805	7
1806	7
1807	7
1808	7
1809	7
1810	7
1811	7
1812	7
1813	7
1814	7
1815	7
1816	7
1817	7
1818	7
1819	7
1820	7
1821	7
1822	7
1823	7
1824	7
1825	7
1826	7
1827	7
1828	7
1829	7
1830	7
1831	7
1832	7
1833	7
1834	7
1835	7
1836	7
1837	7
1838	7
1839	7
1840	7
1841	7
1842	7
1843	7
1844	7
1845	7
1846	7
1847	7
1848	7
1849	7
1850	7
1851	7
1852	7
1853	7
1854	7
1855	7
1856	7
1857	7
1858	7
1859	7
1860	7
1861	7
1862	7
1863	7
1864	7
1865	7
1866	7
1867	7
1868	7
1869	7
1870	7
1871	7
1872	7
1873	7
1874	7
1875	7
1876	7
1877	7
1878	7
1879	7
1880	7
1881	7
1882	7
1883	7
1884	7
1885	7
1886	7
1887	7
1888	7
1889	7
1890	7
1891	7
1892	7
1893	7
1894	7
1895	7
1896	7
1897	7
1898	7
1899	7
1900	7
1901	7
1902	7
1903	7
1904	7
1905	7
1906	7
1907	7
1908	7
1909	7
1910	7
1911	7
1912	7
1913	7
1914	7
1915	7
1916	7
1917	7
1918	7
1919	7
1920	7
1921	7
1922	7
1923	7
1924	7
1925	7
1926	7.03
1927	7.05
1928	7.08
1929	7.11
1930	7.14
1931	7.16
1932	7.19
1933	7.21
1934	7.24
1935	7.26
1936	7.29
1937	7.31
1938	7.33
1939	7.36
1940	7.38
1941	7.4
1942	7.42
1943	7.44
1944	7.46
1945	7.48
1946	7.5
1947	7.52
1948	7.54
1949	7.56
1950	7.57
1951	7.56
1952	7.55
1953	7.54
1954	7.53
1955	7.52
1956	7.51
1957	7.49
1958	7.48
1959	7.46
1960	7.45
1961	7.45
1962	7.45
1963	7.45
1964	7.45
1965	7.45
1966	7.45
1967	7.45
1968	7.45
1969	7.45
1970	7.45
1971	7.45
1972	7.45
1973	7.45
1974	7.45
1975	7.45
1976	7.45
1977	7.45
1978	7.45
1979	7.45
1980	7.45
1981	7.45
1982	7.45
1983	7.45
1984	7.46
1985	7.46
1986	7.46
1987	7.46
1988	7.46
1989	7.46
1990	7.47
1991	7.48
1992	7.5
1993	7.54
1994	7.57
1995	7.61
1996	7.63
1997	7.64
1998	7.62
1999	7.57
2000	7.49
2001	7.39
2002	7.27
2003	7.14
2004	6.99
2005	6.83
2006	6.65
2007	6.46
2008	6.25
2009	6.04
2010	5.82
2011	5.6
2012	5.38
2013	5.17
2014	4.98
2015	4.8
2016	4.64
2017	4.48
2018	4.33