Year Total
1800 4.78
1801 4.78
1802 4.77
1803 4.77
1804 4.77
1805 4.77
1806 4.76
1807 4.76
1808 4.76
1809 4.76
1810 4.75
1811 4.75
1812 4.75
1813 4.75
1814 4.74
1815 4.74
1816 4.74
1817 4.73
1818 4.73
1819 4.73
1820 4.73
1821 4.72
1822 4.72
1823 4.72
1824 4.72
1825 4.71
1826 4.71
1827 4.71
1828 4.71
1829 4.7
1830 4.7
1831 4.69
1832 4.69
1833 4.68
1834 4.67
1835 4.67
1836 4.66
1837 4.65
1838 4.65
1839 4.64
1840 4.64
1841 4.63
1842 4.62
1843 4.62
1844 4.61
1845 4.6
1846 4.6
1847 4.59
1848 4.58
1849 4.58
1850 4.57
1851 4.7
1852 4.34
1853 4.24
1854 4.37
1855 4.11
1856 4.33
1857 4.33
1858 4.49
1859 4.76
1860 4.53
1861 4.46
1862 4.35
1863 4.56
1864 4.43
1865 4.36
1866 4.25
1867 4.32
1868 4.25
1869 4.33
1870 4.43
1871 4.25
1872 4.27
1873 4.36
1874 4.45
1875 4.16
1876 4.62
1877 4.48
1878 4.33
1879 4.45
1880 4.26
1881 4.29
1882 4.18
1883 4.02
1884 4.32
1885 4.01
1886 4.12
1887 3.99
1888 3.89
1889 3.89
1890 3.78
1891 3.94
1892 3.76
1893 3.91
1894 3.82
1895 3.86
1896 3.84
1897 3.97
1898 3.89
1899 4.07
1900 4.04
1901 4.22
1902 4.18
1903 4.14
1904 4.1
1905 4.06
1906 4.03
1907 4
1908 3.98
1909 3.95
1910 3.92
1911 3.75
1912 3.57
1913 3.4
1914 3.22
1915 3.05
1916 3.01
1917 2.96
1918 2.92
1919 2.87
1920 2.83
1921 2.78
1922 2.73
1923 2.67
1924 2.62
1925 2.57
1926 2.6
1927 2.63
1928 2.65
1929 2.68
1930 2.71
1931 2.54
1932 2.37
1933 2.19
1934 2.02
1935 1.85
1936 1.82
1937 1.8
1938 1.77
1939 1.75
1940 1.72
1941 1.73
1942 1.74
1943 1.74
1944 1.75
1945 1.76
1946 2.33
1947 2.89
1948 2.55
1949 2.21
1950 1.87
1951 1.9
1952 1.95
1953 2.01
1954 2.06
1955 2.12
1956 2.17
1957 2.22
1958 2.27
1959 2.31
1960 2.35
1961 2.38
1962 2.39
1963 2.39
1964 2.37
1965 2.34
1966 2.29
1967 2.22
1968 2.14
1969 2.05
1970 1.96
1971 1.87
1972 1.78
1973 1.7
1974 1.63
1975 1.57
1976 1.53
1977 1.5
1978 1.48
1979 1.46
1980 1.46
1981 1.45
1982 1.45
1983 1.45
1984 1.45
1985 1.45
1986 1.46
1987 1.47
1988 1.5
1989 1.53
1990 1.56
1991 1.6
1992 1.64
1993 1.67
1994 1.69
1995 1.71
1996 1.72
1997 1.72
1998 1.72
1999 1.71
2000 1.7
2001 1.68
2002 1.67
2003 1.66
2004 1.65
2005 1.64
2006 1.63
2007 1.62
2008 1.61
2009 1.59
2010 1.58
2011 1.57
2012 1.56
2013 1.55
2014 1.56
2015 1.56
2016 1.57
2017 1.58
2018 1.59