Year Total 1800 5.94 1801 5.94 1802 5.94 1803 5.94 1804 5.94 1805 5.94 1806 5.94 1807 5.94 1808 5.94 1809 5.94 1810 5.94 1811 5.94 1812 5.94 1813 5.94 1814 5.94 1815 5.94 1816 5.94 1817 5.94 1818 5.94 1819 5.94 1820 5.94 1821 5.94 1822 5.94 1823 5.94 1824 5.94 1825 5.94 1826 5.94 1827 5.94 1828 5.94 1829 5.94 1830 5.94 1831 5.94 1832 5.94 1833 5.94 1834 5.94 1835 5.94 1836 5.94 1837 5.94 1838 5.94 1839 5.94 1840 5.94 1841 5.94 1842 5.94 1843 5.94 1844 5.94 1845 5.94 1846 5.94 1847 5.94 1848 5.94 1849 5.94 1850 5.94 1851 5.94 1852 5.94 1853 5.94 1854 5.94 1855 5.94 1856 5.94 1857 5.94 1858 5.94 1859 5.94 1860 5.94 1861 5.94 1862 5.94 1863 5.94 1864 5.94 1865 5.94 1866 5.94 1867 5.94 1868 5.94 1869 5.94 1870 5.94 1871 5.94 1872 5.94 1873 5.94 1874 5.94 1875 5.94 1876 5.94 1877 5.94 1878 5.94 1879 5.94 1880 5.94 1881 5.94 1882 5.94 1883 5.94 1884 5.94 1885 5.94 1886 5.94 1887 5.94 1888 5.94 1889 5.94 1890 5.94 1891 5.94 1892 5.94 1893 5.94 1894 5.94 1895 5.94 1896 5.94 1897 5.94 1898 5.94 1899 5.94 1900 5.94 1901 5.94 1902 5.94 1903 5.94 1904 5.94 1905 5.94 1906 5.94 1907 5.94 1908 5.94 1909 5.94 1910 5.94 1911 5.94 1912 5.94 1913 5.94 1914 5.94 1915 5.94 1916 5.94 1917 5.94 1918 5.94 1919 5.94 1920 5.94 1921 5.94 1922 5.94 1923 5.94 1924 5.94 1925 5.94 1926 5.92 1927 5.9 1928 5.89 1929 5.87 1930 5.85 1931 5.83 1932 5.82 1933 5.8 1934 5.78 1935 5.76 1936 5.75 1937 5.73 1938 5.71 1939 5.69 1940 5.67 1941 5.66 1942 5.64 1943 5.62 1944 5.6 1945 5.59 1946 5.57 1947 5.55 1948 5.53 1949 5.51 1950 5.5 1951 5.5 1952 5.54 1953 5.61 1954 5.71 1955 5.86 1956 6.04 1957 6.25 1958 6.48 1959 6.72 1960 6.95 1961 7.17 1962 7.35 1963 7.48 1964 7.56 1965 7.59 1966 7.6 1967 7.59 1968 7.58 1969 7.58 1970 7.57 1971 7.55 1972 7.5 1973 7.41 1974 7.29 1975 7.14 1976 6.97 1977 6.78 1978 6.59 1979 6.4 1980 6.21 1981 6.03 1982 5.86 1983 5.7 1984 5.53 1985 5.35 1986 5.14 1987 4.91 1988 4.64 1989 4.36 1990 4.05 1991 3.75 1992 3.45 1993 3.18 1994 2.94 1995 2.74 1996 2.57 1997 2.43 1998 2.31 1999 2.22 2000 2.14 2001 2.1 2002 2.08 2003 2.08 2004 2.11 2005 2.17 2006 2.24 2007 2.33 2008 2.43 2009 2.54 2010 2.64 2011 2.72 2012 2.77 2013 2.81 2014 2.81 2015 2.79 2016 2.76 2017 2.71 2018 2.67