Year Total
1800 4.9
1801 4.889
1802 4.878
1803 4.867
1804 4.856
1805 4.844
1806 4.833
1807 4.822
1808 4.811
1809 4.8
1810 4.789
1811 4.778
1812 4.767
1813 4.755
1814 4.744
1815 4.733
1816 4.722
1817 4.711
1818 4.7
1819 4.689
1820 4.678
1821 4.667
1822 4.655
1823 4.644
1824 4.633
1825 4.622
1826 4.611
1827 4.6
1828 4.589
1829 4.578
1830 4.567
1831 4.555
1832 4.544
1833 4.533
1834 4.522
1835 4.511
1836 4.5
1837 4.489
1838 4.478
1839 4.466
1840 4.455
1841 4.444
1842 4.433
1843 4.422
1844 4.411
1845 4.4
1846 4.389
1847 4.378
1848 4.366
1849 4.355
1850 4.344
1851 4.333
1852 4.322
1853 4.311
1854 4.3
1855 4.289
1856 4.278
1857 4.266
1858 4.255
1859 4.244
1860 4.233
1861 4.222
1862 4.211
1863 4.2
1864 4.189
1865 4.177
1866 4.222
1867 4.267
1868 4.312
1869 4.357
1870 4.401
1871 4.446
1872 4.491
1873 4.536
1874 4.58
1875 4.625
1876 4.61
1877 4.595
1878 4.58
1879 4.565
1880 4.55
1881 4.536
1882 4.521
1883 4.506
1884 4.491
1885 4.476
1886 4.506
1887 4.536
1888 4.565
1889 4.595
1890 4.625
1891 4.655
1892 4.685
1893 4.715
1894 4.744
1895 4.774
1896 4.774
1897 4.774
1898 4.774
1899 4.774
1900 4.774
1901 4.774
1902 4.774
1903 4.774
1904 4.774
1905 4.774
1906 4.782
1907 4.789
1908 4.797
1909 4.804
1910 4.812
1911 4.819
1912 4.826
1913 4.834
1914 4.841
1915 4.849
1916 4.911
1917 4.973
1918 5.035
1919 5.098
1920 5.16
1921 5.222
1922 5.284
1923 5.346
1924 5.408
1925 5.471
1926 5.507
1927 5.544
1928 5.581
1929 5.618
1930 5.655
1931 5.692
1932 5.728
1933 5.765
1934 5.802
1935 5.794
1936 5.787
1937 5.779
1938 5.771
1939 5.764
1940 5.756
1941 5.749
1942 5.741
1943 5.733
1944 5.726
1945 5.718
1946 5.71
1947 5.703
1948 5.695
1949 6.045
1950 6.93
1951 5.77
1952 5.96
1953 6.15
1954 6.31
1955 6.605
1956 6.67
1957 6.925
1958 6.815
1959 7.145
1960 7.245
1961 7.31
1962 7.085
1963 7.035
1964 7.27
1965 6.96
1966 6.995
1967 6.395
1968 5.845
1969 4.58
1970 3.9
1971 3.245
1972 2.77
1973 2.69
1974 2.3
1975 2.345
1976 2.255
1977 2.349
1978 2.197
1979 2.187
1980 2.435
1981 2.332
1982 2.236
1983 2.054
1984 2.107
1985 2.241
1986 2.044
1987 2.083
1988 2.317
1989 2.299
1990 2.444
1991 2.421
1992 2.607
1993 2.578
1994 2.527
1995 2.512
1996 2.493
1997 2.69
1998 2.457
1999 2.415
2000 2.329
2001 2.51
2002 2.566
2003 2.372
2004 2.415
2005 2.377
2006 2.256
2007 2.299
2008 2.247
2009 2.359
2010 2.195
2011 2.117
2012 2.019
2013 2.077