Year Total 1801 0 1802 0 1803 0 1804 0 1805 0 1806 0 1807 0 1808 0 1809 0 1810 0 1811 0 1812 0 1813 0 1814 0 1815 0 1816 0 1817 0 1818 0 1819 0 1820 0 1821 2.675 1822 2.675 1823 2.675 1824 2.676 1825 2.675 1826 2.675 1827 2.675 1828 2.675 1829 2.675 1830 2.675 1831 2.675 1832 2.675 1833 2.676 1834 2.675 1835 2.676 1836 2.675 1837 2.675 1838 2.676 1839 2.675 1840 2.675 1841 2.675 1842 2.675 1843 2.676 1844 2.675 1845 2.675 1846 2.675 1847 2.675 1848 2.675 1849 2.676 1850 2.675 1851 1.642 1852 1.642 1853 1.641 1854 1.642 1855 1.642 1856 1.641 1857 1.642 1858 1.641 1859 1.642 1860 1.642 1861 1.642 1862 1.642 1863 1.642 1864 1.641 1865 1.642 1866 1.642 1867 1.642 1868 1.642 1869 1.641 1870 1.642 1871 2.236 1872 2.237 1873 2.236 1874 2.236 1875 2.236 1876 2.237 1877 2.237 1878 2.236 1879 2.236 1880 2.236 1881 2.237 1882 2.236 1883 2.236 1884 2.236 1885 2.237 1886 2.237 1887 2.236 1888 2.237 1889 2.236 1890 2.237 1891 2.236 1892 2.237 1893 2.236 1894 2.237 1895 2.236 1896 2.236 1897 2.236 1898 2.237 1899 2.236 1900 2.236 1901 2.532 1902 2.511 1903 2.49 1904 2.672 1905 2.448 1906 2.625 1907 2.407 1908 2.58 1909 2.558 1910 2.536 1911 2.514 1912 2.673 1913 2.471 1914 1.402 1915 3.666 1916 2.581 1917 2.558 1918 2.536 1919 2.514 1920 2.494 1921 3.832 1922 -8.452 1923 7.022 1924 5.954 1925 10.44 1926 -13.08 1927 0.4779 1928 26.63 1929 11.74 1930 -19.16 1931 -6.445 1932 -10 1933 25.8 1934 -9.225 1935 1.622 1936 -20.43 1937 8.422 1938 3.453 1939 24.2 1940 9.309 1941 9.394 1942 -3.692 1943 9.667 1944 -0.9878 1945 0.4605 1946 8.633 1947 0.2813 1948 8.696 1949 -1.806 1950 16.56 1951 6.517 1952 16.84 1953 2.421 1954 9.47 1955 6.866 1956 0.1567 1957 8.655 1958 0.4926 1959 1.61 1960 1.392 1961 7.424 1962 10.74 1963 10.64 1964 11.47 1965 9.296 1966 3.11 1967 6.777 1968 1.202 1969 6.48 1970 0.8091 1971 4.725 1972 3.328 1973 5.239 1974 14.19 1975 -0.2933 1976 4.987 1977 8.348 1978 -7.038 1979 -26.68 1980 3.041 1981 4.769 1982 -0.7842 1983 5.075 1984 -1.865 1985 -3.962 1986 -2.045 1987 -1.02 1988 -11.56 1989 -1.954 1990 -1.966 1991 -2.874 1992 -0.481 1993 -0.9529 1994 3.435 1995 3.899 1996 4.117 1997 4.544 1998 3.56 1999 18.84 2000 -5.538 2001 2.309 2002 -0.0999 2003 1.731 2004 4.345 2005 3.296 2006 5.274 2007 5.567 2008 3.978 2009 -2.149 2010 3.8 2011 5.625 2012 5.582 2013 4.597