Year Total
1800 4.32
1801 4.07
1802 3.91
1803 4.2
1804 3.94
1805 4.33
1806 4.39
1807 4.27
1808 4
1809 3.21
1810 3.87
1811 3.99
1812 4.26
1813 3.76
1814 3.53
1815 4.4
1816 5.05
1817 4.67
1818 4.43
1819 4.59
1820 4.79
1821 5
1822 4.74
1823 4.88
1824 4.67
1825 4.94
1826 5.01
1827 4.61
1828 4.58
1829 4.84
1830 4.65
1831 4.46
1832 4.3
1833 4.42
1834 4.56
1835 4.7
1836 4.23
1837 4.13
1838 4.36
1839 3.84
1840 4.01
1841 4.29
1842 4.42
1843 4.34
1844 4.31
1845 4.49
1846 4.4
1847 4.43
1848 4.28
1849 4.61
1850 4.45
1851 4.6
1852 4.46
1853 4.6
1854 4.93
1855 4.61
1856 4.42
1857 4.54
1858 4.62
1859 4.82
1860 4.63
1861 4.3
1862 4.52
1863 4.69
1864 4.55
1865 4.6
1866 4.61
1867 4.38
1868 4.3
1869 4.22
1870 4.26
1871 4.29
1872 4.4
1873 4.41
1874 4.59
1875 4.67
1876 4.68
1877 4.69
1878 4.64
1879 4.71
1880 4.53
1881 4.4
1882 4.47
1883 4.51
1884 4.59
1885 4.56
1886 4.48
1887 4.56
1888 4.42
1889 4.31
1890 4.43
1891 4.51
1892 4.35
1893 4.47
1894 4.38
1895 4.52
1896 4.47
1897 4.48
1898 4.53
1899 4.47
1900 4.4
1901 4.37
1902 4.26
1903 4.16
1904 4.07
1905 3.95
1906 3.92
1907 3.87
1908 3.87
1909 3.96
1910 3.82
1911 3.8
1912 3.72
1913 3.64
1914 3.62
1915 3.37
1916 3.43
1917 3.53
1918 3.44
1919 3.17
1920 3.61
1921 3.31
1922 3.18
1923 3.09
1924 2.85
1925 2.61
1926 2.59
1927 2.38
1928 2.34
1929 2.23
1930 2.19
1931 2.08
1932 2.04
1933 1.86
1934 1.82
1935 1.78
1936 1.8
1937 1.84
1938 1.88
1939 1.91
1940 1.95
1941 1.83
1942 2.11
1943 2.26
1944 2.45
1945 2.43
1946 2.77
1947 2.66
1948 2.6
1949 2.52
1950 2.52
1951 2.48
1952 2.61
1953 2.66
1954 2.7
1955 2.79
1956 2.86
1957 2.86
1958 2.89
1959 2.91
1960 2.88
1961 2.91
1962 2.89
1963 2.91
1964 2.96
1965 2.93
1966 2.89
1967 2.8
1968 2.75
1969 2.69
1970 2.5
1971 2.49
1972 2.38
1973 2.23
1974 2.13
1975 1.98
1976 1.86
1977 1.75
1978 1.77
1979 1.75
1980 1.72
1981 1.7
1982 1.71
1983 1.66
1984 1.66
1985 1.68
1986 1.71
1987 1.75
1988 1.84
1989 1.89
1990 1.93
1991 1.92
1992 1.88
1993 1.86
1994 1.87
1995 1.87
1996 1.89
1997 1.86
1998 1.81
1999 1.85
2000 1.85
2001 1.78
2002 1.75
2003 1.8
2004 1.83
2005 1.84
2006 1.9
2007 1.9
2008 1.96
2009 1.98
2010 1.95
2011 1.88
2012 1.85
2013 1.91
2014 1.87
2015 1.84
2016 1.82
2017 1.82
2018 1.83