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	7.01
1844	7.02
1845	7.03
1846	7.05
1847	7.06
1848	7.08
1849	7.08
1850	7.07
1851	7.07
1852	7.07
1853	7.06
1854	7.05
1855	7.03
1856	7.01
1857	7
1858	6.98
1859	6.97
1860	6.95
1861	6.93
1862	6.95
1863	6.96
1864	6.98
1865	6.99
1866	7.01
1867	7.02
1868	6.51
1869	6.87
1870	6.74
1871	7.03
1872	6.85
1873	7.24
1874	7.17
1875	7.15
1876	7.02
1877	6.87
1878	6.58
1879	6.98
1880	6.8
1881	6.66
1882	7.03
1883	6.89
1884	6.83
1885	6.74
1886	6.47
1887	6.61
1888	6.96
1889	6.8
1890	6.71
1891	7.44
1892	6.57
1893	7.17
1894	7.18
1895	7.34
1896	7.43
1897	7.52
1898	7.28
1899	7.36
1900	7.36
1901	7.2
1902	7.36
1903	7.2
1904	7.24
1905	6.72
1906	7.04
1907	7.08
1908	7.44
1909	7.12
1910	7.2
1911	7.2
1912	7.04
1913	6.96
1914	6.88
1915	3.36
1916	5.2
1917	5.04
1918	5.72
1919	3.44
1920	6.72
1921	4.72
1922	6
1923	6.48
1924	6.72
1925	6.8
1926	6.72
1927	6.64
1928	6.52
1929	6.16
1930	5.76
1931	5.6
1932	5.04
1933	4
1934	3.56
1935	4.24
1936	4.56
1937	5.04
1938	4.96
1939	4.88
1940	4.2
1941	4.6
1942	2.96
1943	1.68
1944	1.72
1945	1.92
1946	2.8
1947	2.96
1948	2.56
1949	3.12
1950	2.88
1951	2.88
1952	2.88
1953	2.72
1954	2.96
1955	2.8
1956	2.72
1957	2.76
1958	2.69
1959	2.58
1960	2.56
1961	2.46
1962	2.34
1963	2.28
1964	2.16
1965	2.09
1966	2.1
1967	2.01
1968	1.97
1969	1.98
1970	2
1971	2.02
1972	2.03
1973	1.96
1974	2
1975	1.97
1976	1.95
1977	1.92
1978	1.9
1979	1.87
1980	1.86
1981	1.88
1982	1.96
1983	2.09
1984	2.05
1985	2.05
1986	2.18
1987	2.23
1988	2.14
1989	2.02
1990	1.89
1991	1.73
1992	1.55
1993	1.37
1994	1.4
1995	1.34
1996	1.27
1997	1.22
1998	1.23
1999	1.16
2000	1.2
2001	1.22
2002	1.29
2003	1.33
2004	1.34
2005	1.29
2006	1.3
2007	1.41
2008	1.49
2009	1.54
2010	1.57
2011	1.59
2012	1.62
2013	1.66
2014	1.7
2015	1.74
2016	1.75
2017	1.76
2018	1.76