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 6.95
1882 6.89
1883 6.84
1884 6.78
1885 6.73
1886 6.68
1887 6.62
1888 6.57
1889 6.51
1890 6.46
1891 6.41
1892 6.35
1893 6.3
1894 6.24
1895 6.19
1896 6.14
1897 6.08
1898 6.05
1899 6.02
1900 5.99
1901 5.96
1902 5.92
1903 5.89
1904 5.86
1905 5.83
1906 5.8
1907 5.77
1908 5.73
1909 5.7
1910 5.67
1911 5.64
1912 5.61
1913 5.58
1914 5.54
1915 5.51
1916 5.48
1917 5.45
1918 5.42
1919 5.38
1920 5.35
1921 5.32
1922 5.29
1923 5.26
1924 5.23
1925 5.19
1926 5.16
1927 5.05
1928 4.94
1929 4.83
1930 4.71
1931 4.6
1932 4.49
1933 4.38
1934 4.26
1935 4.15
1936 4.04
1937 3.93
1938 3.81
1939 3.7
1940 3.59
1941 3.48
1942 3.37
1943 3.27
1944 3.16
1945 3.05
1946 2.95
1947 2.84
1948 2.73
1949 2.62
1950 2.52
1951 2.54
1952 2.59
1953 2.64
1954 2.68
1955 2.7
1956 2.73
1957 2.74
1958 2.73
1959 2.72
1960 2.69
1961 2.66
1962 2.61
1963 2.55
1964 2.49
1965 2.43
1966 2.37
1967 2.33
1968 2.29
1969 2.27
1970 2.25
1971 2.24
1972 2.23
1973 2.22
1974 2.19
1975 2.17
1976 2.14
1977 2.11
1978 2.1
1979 2.08
1980 2.08
1981 2.08
1982 2.09
1983 2.1
1984 2.11
1985 2.11
1986 2.1
1987 2.07
1988 2.03
1989 1.97
1990 1.9
1991 1.82
1992 1.73
1993 1.64
1994 1.55
1995 1.47
1996 1.4
1997 1.34
1998 1.29
1999 1.26
2000 1.24
2001 1.24
2002 1.24
2003 1.26
2004 1.29
2005 1.32
2006 1.36
2007 1.4
2008 1.45
2009 1.5
2010 1.54
2011 1.58
2012 1.62
2013 1.65
2014 1.67
2015 1.69
2016 1.7
2017 1.71
2018 1.72
