Year Total
1800 4.14
1801 4.14
1802 4.14
1803 4.14
1804 4.14
1805 4.14
1806 4.14
1807 4.14
1808 4.14
1809 4.14
1810 4.14
1811 4.14
1812 4.14
1813 4.14
1814 4.14
1815 4.14
1816 4.14
1817 4.14
1818 4.14
1819 4.14
1820 4.14
1821 4.14
1822 4.14
1823 4.14
1824 4.14
1825 4.14
1826 4.14
1827 4.14
1828 4.14
1829 4.14
1830 4.14
1831 4.14
1832 4.14
1833 4.14
1834 4.14
1835 4.14
1836 4.14
1837 4.14
1838 4.14
1839 4.14
1840 4.14
1841 4.14
1842 4.14
1843 4.14
1844 4.14
1845 4.14
1846 4.14
1847 4.14
1848 4.14
1849 4.14
1850 4.14
1851 4.02
1852 3.89
1853 3.74
1854 3.65
1855 3.44
1856 3.82
1857 3.85
1858 4.05
1859 4.27
1860 4.19
1861 4.14
1862 4.18
1863 4.32
1864 4.32
1865 4.26
1866 4.33
1867 4.16
1868 4.04
1869 4.14
1870 3.99
1871 3.99
1872 3.99
1873 3.98
1874 4.07
1875 4.26
1876 4.4
1877 4.29
1878 4.19
1879 4.09
1880 3.97
1881 3.99
1882 3.87
1883 3.82
1884 3.79
1885 3.71
1886 3.73
1887 3.74
1888 3.71
1889 3.7
1890 3.56
1891 3.78
1892 3.71
1893 3.74
1894 3.66
1895 3.66
1896 3.77
1897 3.79
1898 3.82
1899 3.89
1900 3.83
1901 3.89
1902 3.82
1903 3.67
1904 3.66
1905 3.6
1906 3.6
1907 3.51
1908 3.54
1909 3.42
1910 3.1
1911 3.07
1912 3.04
1913 3.01
1914 3
1915 2.61
1916 2.53
1917 2.48
1918 2.47
1919 2.49
1920 2.34
1921 2.37
1922 2.4
1923 2.43
1924 2.36
1925 2.3
1926 2.23
1927 2.17
1928 2.1
1929 2.05
1930 1.99
1931 1.97
1932 1.94
1933 1.89
1934 1.88
1935 1.84
1936 1.8
1937 1.74
1938 1.78
1939 1.79
1940 1.82
1941 2.05
1942 2.27
1943 2.4
1944 2.5
1945 2.6
1946 2.62
1947 2.56
1948 2.54
1949 2.44
1950 2.33
1951 2.32
1952 2.3
1953 2.3
1954 2.31
1955 2.33
1956 2.36
1957 2.39
1958 2.43
1959 2.48
1960 2.52
1961 2.55
1962 2.58
1963 2.58
1964 2.56
1965 2.53
1966 2.47
1967 2.4
1968 2.31
1969 2.22
1970 2.12
1971 2.02
1972 1.92
1973 1.83
1974 1.74
1975 1.67
1976 1.61
1977 1.57
1978 1.54
1979 1.52
1980 1.51
1981 1.51
1982 1.52
1983 1.53
1984 1.54
1985 1.54
1986 1.54
1987 1.55
1988 1.55
1989 1.55
1990 1.55
1991 1.54
1992 1.54
1993 1.53
1994 1.53
1995 1.52
1996 1.5
1997 1.49
1998 1.47
1999 1.45
2000 1.44
2001 1.43
2002 1.42
2003 1.42
2004 1.42
2005 1.43
2006 1.44
2007 1.46
2008 1.47
2009 1.49
2010 1.5
2011 1.51
2012 1.52
2013 1.53
2014 1.54
2015 1.54
2016 1.55
2017 1.55
2018 1.55