Year Total 1800 5.83 1801 5.83 1802 5.83 1803 5.83 1804 5.83 1805 5.83 1806 5.83 1807 5.83 1808 5.83 1809 5.83 1810 5.83 1811 5.83 1812 5.83 1813 5.83 1814 5.83 1815 5.83 1816 5.83 1817 5.83 1818 5.83 1819 5.83 1820 5.83 1821 5.83 1822 5.83 1823 5.83 1824 5.83 1825 5.83 1826 5.83 1827 5.83 1828 5.83 1829 5.83 1830 5.83 1831 5.83 1832 5.83 1833 5.83 1834 5.83 1835 5.83 1836 5.83 1837 5.83 1838 5.83 1839 5.83 1840 5.83 1841 5.83 1842 5.83 1843 5.83 1844 5.83 1845 5.83 1846 5.83 1847 5.83 1848 5.83 1849 5.83 1850 5.83 1851 5.83 1852 5.83 1853 5.83 1854 5.83 1855 5.83 1856 5.83 1857 5.83 1858 5.83 1859 5.83 1860 5.83 1861 5.83 1862 5.83 1863 5.83 1864 5.83 1865 5.83 1866 5.83 1867 5.83 1868 5.83 1869 5.83 1870 5.83 1871 5.83 1872 5.83 1873 5.83 1874 5.83 1875 5.83 1876 5.822 1877 5.815 1878 5.807 1879 5.8 1880 5.792 1881 5.785 1882 5.777 1883 5.77 1884 5.762 1885 5.755 1886 5.747 1887 5.74 1888 5.732 1889 5.725 1890 5.717 1891 5.71 1892 5.702 1893 5.695 1894 5.687 1895 5.68 1896 5.672 1897 5.665 1898 5.657 1899 5.65 1900 5.642 1901 5.635 1902 5.627 1903 5.62 1904 5.612 1905 5.605 1906 5.597 1907 5.67 1908 5.539 1909 5.829 1910 5.989 1911 6.061 1912 5.989 1913 5.916 1914 6.003 1915 5.8 1916 5.409 1917 5.931 1918 5.756 1919 5.582 1920 5.728 1921 6.206 1922 6.061 1923 5.67 1924 6.003 1925 5.916 1926 6.337 1927 6.264 1928 6.337 1929 6.38 1930 6.496 1931 6.641 1932 6.38 1933 6.423 1934 6.467 1935 6.511 1936 6.308 1937 6.496 1938 6.25 1939 6.337 1940 6.235 1941 5.96 1942 5.843 1943 5.8 1944 5.738 1945 5.677 1946 5.615 1947 5.553 1948 5.8 1949 6.046 1950 6.293 1951 6.337 1952 6.38 1953 6.423 1954 6.467 1955 6.489 1956 6.51 1957 6.326 1958 6.142 1959 5.958 1960 5.774 1961 5.59 1962 5.436 1963 5.282 1964 5.128 1965 4.974 1966 4.82 1967 4.598 1968 4.376 1969 4.154 1970 3.932 1971 3.71 1972 3.586 1973 3.462 1974 3.338 1975 3.214 1976 3.09 1977 2.902 1978 2.715 1979 2.67 1980 2.515 1981 2.455 1982 2.32 1983 2.17 1984 2.055 1985 1.88 1986 1.68 1987 1.7 1988 1.855 1989 1.68 1990 1.81 1991 1.72 1992 1.73 1993 1.76 1994 1.755 1995 1.775 1996 1.76 1997 1.77 1998 1.465 1999 1.555 2000 1.68 2001 1.4 2002 1.34 2003 1.235 2004 1.18 2005 1.115 2006 1.115 2007 1.1 2008 1.05 2009 1.03 2010 0.895 2011 1.065 2012 1.27 2013 1.065