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