Year Total
1800 7.03
1801 7.01
1802 6.99
1803 6.96
1804 6.94
1805 6.92
1806 6.9
1807 6.87
1808 6.85
1809 6.83
1810 6.81
1811 6.79
1812 6.76
1813 6.74
1814 6.72
1815 6.7
1816 6.67
1817 6.65
1818 6.63
1819 6.61
1820 6.59
1821 6.57
1822 6.54
1823 6.52
1824 6.5
1825 6.48
1826 6.46
1827 6.44
1828 6.42
1829 6.4
1830 6.38
1831 6.36
1832 6.34
1833 6.32
1834 6.3
1835 6.28
1836 6.26
1837 6.24
1838 6.22
1839 6.2
1840 6.18
1841 6.14
1842 6.09
1843 6.05
1844 6
1845 5.96
1846 5.91
1847 5.87
1848 5.82
1849 5.78
1850 5.73
1851 5.69
1852 5.64
1853 5.6
1854 5.55
1855 5.51
1856 5.46
1857 5.42
1858 5.37
1859 5.33
1860 5.28
1861 5.26
1862 5.23
1863 5.2
1864 5.18
1865 5.15
1866 5.12
1867 5.1
1868 5.07
1869 5.04
1870 5.02
1871 4.99
1872 4.96
1873 4.94
1874 4.91
1875 4.88
1876 4.86
1877 4.83
1878 4.8
1879 4.77
1880 4.75
1881 4.7
1882 4.66
1883 4.61
1884 4.57
1885 4.52
1886 4.48
1887 4.43
1888 4.39
1889 4.35
1890 4.3
1891 4.26
1892 4.21
1893 4.17
1894 4.12
1895 4.08
1896 4.03
1897 3.99
1898 3.94
1899 3.9
1900 3.85
1901 3.85
1902 3.84
1903 3.83
1904 3.79
1905 3.75
1906 3.71
1907 3.67
1908 3.63
1909 3.58
1910 3.59
1911 3.57
1912 3.56
1913 3.45
1914 3.57
1915 3.52
1916 3.47
1917 3.33
1918 3.31
1919 3.07
1920 3.26
1921 3.33
1922 3.11
1923 3.1
1924 3.12
1925 3.01
1926 2.9
1927 2.82
1928 2.66
1929 2.53
1930 2.53
1931 2.4
1932 2.32
1933 2.01
1934 2.07
1935 2.04
1936 2.01
1937 2.04
1938 2.09
1939 2.05
1940 2.11
1941 2.23
1942 2.47
1943 2.57
1944 2.44
1945 2.38
1946 2.83
1947 3.16
1948 3.01
1949 3.02
1950 3.02
1951 3.2
1952 3.3
1953 3.37
1954 3.49
1955 3.54
1956 3.65
1957 3.74
1958 3.69
1959 3.69
1960 3.67
1961 3.63
1962 3.48
1963 3.35
1964 3.22
1965 2.93
1966 2.71
1967 2.56
1968 2.47
1969 2.46
1970 2.46
1971 2.27
1972 2.01
1973 1.87
1974 1.83
1975 1.77
1976 1.74
1977 1.78
1978 1.75
1979 1.8
1980 1.82
1981 1.81
1982 1.81
1983 1.78
1984 1.79
1985 1.84
1986 1.84
1987 1.87
1988 1.92
1989 2
1990 2.07
1991 2.06
1992 2.04
1993 2.02
1994 2
1995 1.98
1996 1.98
1997 1.97
1998 2
1999 2.01
2000 2.05
2001 2.03
2002 2.02
2003 2.05
2004 2.06
2005 2.06
2006 2.11
2007 2.12
2008 2.07
2009 2
2010 1.93
2011 1.9
2012 1.9
2013 1.96
2014 1.95
2015 1.93
2016 1.92
2017 1.91
2018 1.9