Year Total 1800 6.4 1801 6.4 1802 6.4 1803 6.4 1804 6.4 1805 6.4 1806 6.4 1807 6.4 1808 6.4 1809 6.4 1810 6.4 1811 6.4 1812 6.4 1813 6.4 1814 6.4 1815 6.4 1816 6.4 1817 6.4 1818 6.4 1819 6.4 1820 6.4 1821 6.4 1822 6.4 1823 6.4 1824 6.4 1825 6.4 1826 6.4 1827 6.4 1828 6.4 1829 6.4 1830 6.4 1831 6.4 1832 6.4 1833 6.4 1834 6.4 1835 6.4 1836 6.4 1837 6.4 1838 6.4 1839 6.4 1840 6.4 1841 6.4 1842 6.4 1843 6.4 1844 6.4 1845 6.4 1846 6.4 1847 6.4 1848 6.4 1849 6.4 1850 6.4 1851 6.4 1852 6.4 1853 6.4 1854 6.4 1855 6.4 1856 6.4 1857 6.4 1858 6.4 1859 6.4 1860 6.4 1861 6.4 1862 6.4 1863 6.4 1864 6.4 1865 6.4 1866 6.4 1867 6.4 1868 6.4 1869 6.4 1870 6.4 1871 6.4 1872 6.4 1873 6.4 1874 6.4 1875 6.4 1876 6.4 1877 6.4 1878 6.4 1879 6.4 1880 6.4 1881 6.4 1882 6.4 1883 6.4 1884 6.4 1885 6.4 1886 6.4 1887 6.4 1888 6.4 1889 6.4 1890 6.4 1891 6.4 1892 6.4 1893 6.4 1894 6.4 1895 6.4 1896 6.4 1897 6.4 1898 6.4 1899 6.4 1900 6.4 1901 6.4 1902 6.4 1903 6.4 1904 6.4 1905 6.4 1906 6.4 1907 6.4 1908 6.4 1909 6.4 1910 6.4 1911 6.4 1912 6.4 1913 6.4 1914 6.4 1915 6.4 1916 6.4 1917 6.4 1918 6.4 1919 6.4 1920 6.4 1921 6.4 1922 6.4 1923 6.4 1924 6.4 1925 6.4 1926 6.4 1927 6.4 1928 6.4 1929 6.4 1930 6.4 1931 6.375 1932 6.351 1933 6.326 1934 6.301 1935 6.276 1936 6.252 1937 6.227 1938 6.202 1939 6.178 1940 6.153 1941 6.128 1942 6.104 1943 6.079 1944 6.054 1945 6.029 1946 6.005 1947 5.483 1948 4.932 1949 5.836 1950 6.741 1951 6.736 1952 6.73 1953 6.736 1954 6.754 1955 6.784 1956 6.824 1957 6.874 1958 6.93 1959 6.988 1960 7.043 1961 7.088 1962 7.118 1963 7.125 1964 7.107 1965 7.059 1966 6.978 1967 6.869 1968 6.737 1969 6.59 1970 6.438 1971 6.292 1972 6.16 1973 6.046 1974 5.95 1975 5.867 1976 5.79 1977 5.706 1978 5.606 1979 5.488 1980 5.349 1981 5.189 1982 5.015 1983 4.833 1984 4.645 1985 4.454 1986 4.265 1987 4.077 1988 3.893 1989 3.714 1990 3.538 1991 3.363 1992 3.188 1993 3.013 1994 2.841 1995 2.676 1996 2.524 1997 2.389 1998 2.275 1999 2.183 2000 2.114 2001 2.068 2002 2.041 2003 2.027 2004 2.023 2005 2.025 2006 2.031 2007 2.038 2008 2.044 2009 2.046 2010 2.044 2011 2.036 2012 2.023 2013 2.008 2014 1.99 2015 1.97 2016 1.949 2017 1.928 2018 1.907 2019 1.889 2020 1.872 2021 1.856 2022 1.843 2023 1.83 2024 1.818 2030 1.77 2040 1.749 2050 1.76 2070 1.804 2080 1.824 2099 1.854