Year Total 1801 0.1043 1802 0.1043 1803 0.1043 1804 0.1043 1805 0.1043 1806 0.1043 1807 0.1043 1808 0.1043 1809 0.1043 1810 0.1043 1811 0.1043 1812 0.1043 1813 0.1043 1814 0.1043 1815 0.1043 1816 0.1043 1817 0.1043 1818 0.1043 1819 0.1043 1820 0.1043 1821 1.792 1822 1.792 1823 1.792 1824 1.792 1825 1.792 1826 1.792 1827 1.792 1828 1.792 1829 1.792 1830 1.792 1831 1.792 1832 1.792 1833 1.792 1834 1.792 1835 1.792 1836 1.792 1837 1.792 1838 1.792 1839 1.792 1840 1.792 1841 1.792 1842 1.792 1843 1.792 1844 1.792 1845 1.792 1846 1.792 1847 1.792 1848 1.792 1849 1.792 1850 1.792 1851 1.792 1852 1.792 1853 1.792 1854 1.792 1855 1.792 1856 1.792 1857 1.792 1858 1.792 1859 1.792 1860 1.792 1861 1.792 1862 1.792 1863 1.792 1864 1.792 1865 1.792 1866 1.792 1867 1.792 1868 1.792 1869 1.792 1870 1.792 1871 1.792 1872 1.792 1873 1.792 1874 1.792 1875 1.792 1876 1.792 1877 1.792 1878 1.792 1879 1.792 1880 1.792 1881 1.792 1882 1.792 1883 1.792 1884 1.792 1885 1.792 1886 1.792 1887 1.792 1888 1.792 1889 1.792 1890 1.792 1891 1.792 1892 1.792 1893 1.792 1894 1.792 1895 1.792 1896 1.792 1897 1.792 1898 1.792 1899 1.792 1900 1.792 1901 1.792 1902 1.792 1903 1.792 1904 1.792 1905 1.792 1906 1.792 1907 1.792 1908 1.792 1909 1.792 1910 1.792 1911 1.792 1912 1.792 1913 1.792 1914 2.77 1915 2.77 1916 2.77 1917 2.77 1918 2.77 1919 2.77 1920 2.77 1921 2.77 1922 2.77 1923 2.77 1924 2.77 1925 2.77 1926 2.77 1927 2.77 1928 2.77 1929 2.77 1930 2.77 1931 2.77 1932 2.77 1933 2.77 1934 2.77 1935 2.77 1936 2.77 1937 2.77 1938 2.77 1939 2.77 1940 2.77 1941 2.77 1942 2.77 1943 2.77 1944 2.77 1945 2.77 1946 2.77 1947 2.77 1948 2.77 1949 2.77 1950 2.77 1951 3.286 1952 3.586 1953 3.812 1954 3.988 1955 4.138 1956 4.285 1957 4.447 1958 4.638 1959 4.862 1960 5.104 1961 5.33 1962 5.493 1963 5.549 1964 5.483 1965 5.333 1966 5.167 1967 5.015 1968 4.853 1969 4.688 1970 4.527 1971 4.366 1972 4.216 1973 4.095 1974 1.842 1975 1.787 1976 1.735 1977 1.69 1978 1.679 1979 1.706 1980 1.756 1981 1.804 1982 1.835 1983 1.855 1984 1.859 1985 1.843 1986 1.849 1987 1.838 1988 1.731 1989 1.505 1990 1.214 1991 -8.299 1992 -14.03 1993 -14.83 1994 -19.39 1995 -5.343 1996 7.096 1997 10.23 1998 2.464 1999 3.848 2000 5.407 2001 4.916 2002 -0.874 2003 5.544 2004 5.903 2005 -0.9839 2006 2.789 2007 8.865 2008 7.721 2009 2.874 2010 -0.3662 2011 6.099 2012 -0.8709 2013 10.55