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
