Year Total
1800 4.97
1801 4.6
1802 5.3
1803 5.61
1804 5.65
1805 5.55
1806 5.49
1807 5.45
1808 5.4
1809 5.24
1810 5.36
1811 5.43
1812 5.31
1813 5.45
1814 5.46
1815 6.02
1816 5.73
1817 5.69
1818 5.54
1819 5.45
1820 5.4
1821 5.55
1822 5.69
1823 5.54
1824 5.42
1825 5.38
1826 5.36
1827 5.07
1828 5.23
1829 4.85
1830 4.83
1831 4.78
1832 4.78
1833 5
1834 4.89
1835 4.83
1836 4.86
1837 4.79
1838 4.78
1839 4.93
1840 4.9
1841 4.89
1842 4.83
1843 4.82
1844 4.83
1845 4.75
1846 4.9
1847 4.58
1848 4.71
1849 4.78
1850 4.85
1851 4.94
1852 4.94
1853 4.78
1854 4.89
1855 4.85
1856 4.94
1857 4.9
1858 4.79
1859 4.97
1860 4.86
1861 4.88
1862 4.92
1863 4.94
1864 4.96
1865 4.94
1866 4.92
1867 4.94
1868 4.97
1869 4.82
1870 4.88
1871 4.85
1872 4.89
1873 4.94
1874 4.93
1875 4.92
1876 4.9
1877 4.89
1878 4.88
1879 4.81
1880 4.75
1881 4.68
1882 4.62
1883 4.55
1884 4.47
1885 4.39
1886 4.32
1887 4.24
1888 4.16
1889 4.11
1890 4.06
1891 4
1892 3.95
1893 3.9
1894 3.84
1895 3.79
1896 3.73
1897 3.68
1898 3.62
1899 3.58
1900 3.53
1901 3.49
1902 3.44
1903 3.4
1904 3.35
1905 3.3
1906 3.24
1907 3.19
1908 3.14
1909 3.07
1910 2.99
1911 2.92
1912 2.9
1913 2.93
1914 2.88
1915 2.59
1916 2.6
1917 2.1
1918 2.03
1919 2.31
1920 3.08
1921 2.69
1922 2.44
1923 2.38
1924 2.28
1925 2.2
1926 2.15
1927 2.01
1928 2.01
1929 1.95
1930 1.95
1931 1.89
1932 1.83
1933 1.72
1934 1.76
1935 1.75
1936 1.77
1937 1.79
1938 1.84
1939 1.84
1940 1.74
1941 1.72
1942 1.93
1943 2.03
1944 2.25
1945 2.05
1946 2.47
1947 2.7
1948 2.39
1949 2.26
1950 2.08
1951 2.1
1952 2.15
1953 2.2
1954 2.26
1955 2.33
1956 2.4
1957 2.48
1958 2.55
1959 2.63
1960 2.69
1961 2.75
1962 2.79
1963 2.8
1964 2.79
1965 2.76
1966 2.7
1967 2.61
1968 2.52
1969 2.41
1970 2.29
1971 2.18
1972 2.07
1973 1.98
1974 1.89
1975 1.83
1976 1.78
1977 1.74
1978 1.73
1979 1.72
1980 1.73
1981 1.74
1982 1.76
1983 1.78
1984 1.8
1985 1.81
1986 1.82
1987 1.83
1988 1.83
1989 1.82
1990 1.81
1991 1.8
1992 1.79
1993 1.78
1994 1.77
1995 1.76
1996 1.74
1997 1.73
1998 1.71
1999 1.69
2000 1.68
2001 1.67
2002 1.67
2003 1.69
2004 1.72
2005 1.76
2006 1.8
2007 1.84
2008 1.86
2009 1.88
2010 1.89
2011 1.89
2012 1.89
2013 1.88
2014 1.88
2015 1.88
2016 1.87
2017 1.87
2018 1.87