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 0.8167 1822 0.84 1823 0.8374 1824 0.8348 1825 0.8068 1826 0.8298 1827 0.8524 1828 0.8246 1829 0.8221 1830 0.8197 1831 0.8419 1832 0.8392 1833 0.8122 1834 0.8341 1835 0.8316 1836 0.829 1837 0.8265 1838 0.824 1839 0.8452 1840 0.819 1841 0.84 1842 0.814 1843 0.8348 1844 0.8323 1845 0.8297 1846 0.8272 1847 0.8247 1848 0.8448 1849 0.8196 1850 0.8396 1851 0.8147 1852 0.8345 1853 0.8319 1854 0.8293 1855 0.8268 1856 0.8243 1857 0.8434 1858 0.8193 1859 0.8382 1860 0.8356 1861 0.8119 1862 0.8306 1863 0.828 1864 0.8464 1865 0.8229 1866 0.8205 1867 0.8386 1868 0.836 1869 0.813 1870 0.8309 1871 0.8284 1872 0.8459 1873 0.8233 1874 0.8208 1875 0.8381 1876 0.8355 1877 0.8134 1878 0.8305 1879 0.8279 1880 0.8447 1881 0.8228 1882 0.8204 1883 0.8369 1884 0.8343 1885 0.8317 1886 0.8292 1887 0.8266 1888 0.8241 1889 0.8401 1890 0.8191 1891 0.8349 1892 0.8324 1893 0.8298 1894 0.8273 1895 0.8248 1896 0.8401 1897 0.8197 1898 0.8349 1899 0.8323 1900 0.8298 1901 0.8272 1902 0.8247 1903 0.8223 1904 0.8369 1905 0.8343 1906 0.8317 1907 0.8291 1908 0.8266 1909 0.8241 1910 0.8382 1911 0.8191 1912 0.8331 1913 0.8305 1914 6.157 1915 6.154 1916 6.168 1917 6.149 1918 6.163 1919 6.16 1920 6.157 1921 6.155 1922 6.152 1923 6.166 1924 6.163 1925 6.16 1926 6.158 1927 6.155 1928 6.152 1929 6.166 1930 6.147 1931 6.16 1932 6.158 1933 6.155 1934 6.168 1935 6.15 1936 6.162 1937 6.16 1938 6.157 1939 6.154 1940 6.167 1941 6.149 1942 6.161 1943 6.159 1944 6.156 1945 6.168 1946 6.151 1947 6.163 1948 6.16 1949 6.157 1950 6.155 1951 6.422 1952 7.36 1953 8.08 1954 8.553 1955 8.869 1956 9.029 1957 9.059 1958 9.011 1959 8.882 1960 8.717 1961 8.509 1962 8.283 1963 8.031 1964 7.784 1965 7.511 1966 7.224 1967 6.939 1968 6.818 1969 6.843 1970 6.987 1971 -2.131 1972 11.95 1973 21.31 1974 45.03 1975 5.264 1976 -27.08 1977 -5.155 1978 0.3886 1979 -9.832 1980 -45.98 1981 -10.38 1982 3.599 1983 -0.8541 1984 2.539 1985 -9.127 1986 -0.437 1987 -1.094 1988 21.1 1989 4.182 1990 7.062 1991 -3.694 1992 -6.301 1993 -12.25 1994 7.273 1995 10.73 1996 10.12 1997 1.932 1998 1.592 1999 -5.754 2000 -0.00655 2001 1.065 2002 -3.658 2003 -1.406 2004 4.842 2005 5.5 2006 3 2007 2.1 2008 -1 2009 2.9 2010 2 2011 1.8 2012 8.305 2013 1.006