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 0.3186 1822 0.3186 1823 0.3186 1824 0.3186 1825 0.3186 1826 0.3186 1827 0.3186 1828 0.3186 1829 0.3186 1830 0.3186 1831 0.3186 1832 0.3186 1833 0.3186 1834 0.3186 1835 0.3186 1836 0.3186 1837 0.3186 1838 0.3186 1839 0.3186 1840 0.3186 1841 0.3186 1842 0.3186 1843 0.3186 1844 0.3186 1845 0.3186 1846 0.3186 1847 0.3186 1848 0.3186 1849 0.3186 1850 0.3186 1851 0.32 1852 0.32 1853 0.32 1854 0.32 1855 0.3201 1856 0.32 1857 0.3201 1858 0.32 1859 0.32 1860 0.32 1861 0.3201 1862 0.32 1863 0.32 1864 0.32 1865 0.3201 1866 0.32 1867 0.3201 1868 0.32 1869 0.32 1870 0.32 1871 0.6759 1872 0.6759 1873 0.6759 1874 0.6759 1875 0.6759 1876 0.6759 1877 0.6759 1878 0.6759 1879 0.6759 1880 0.6759 1881 0.6759 1882 0.6759 1883 0.6759 1884 0.6759 1885 0.6759 1886 0.6759 1887 0.6759 1888 0.6759 1889 0.6759 1890 0.6759 1891 1.728 1892 1.728 1893 1.728 1894 1.728 1895 1.728 1896 1.728 1897 1.728 1898 1.728 1899 1.728 1900 1.728 1901 1.721 1902 1.332 1903 20.16 1904 -3.526 1905 -17.4 1906 7.283 1907 11.82 1908 4.09 1909 12.72 1910 3.06 1911 -4.828 1912 -4.029 1913 10.83 1914 -1.924 1915 5.108 1916 8.428 1917 13.33 1918 -3.497 1919 3.725 1920 -0.1455 1921 4.848 1922 12.87 1923 3.666 1924 9.221 1925 5.982 1926 2.185 1927 0.3657 1928 3.066 1929 5.505 1930 4.207 1931 1.531 1932 6.197 1933 -2.736 1934 5.485 1935 10.55 1936 6.031 1937 1.408 1938 6.842 1939 -1.544 1940 -6.562 1941 -3.606 1942 5.153 1943 -6.925 1944 -14.52 1945 -45.22 1946 8.39 1947 11.63 1948 30.83 1949 21 1950 30.6 1951 7.421 1952 12.57 1953 9.452 1954 9.606 1955 7.798 1956 3.576 1957 7.805 1958 6.511 1959 6.951 1960 8.402 1961 6.565 1962 9.086 1963 13.56 1964 13.25 1965 7.708 1966 10.28 1967 10.75 1968 10.07 1969 9.408 1970 10.19 1971 14.34 1972 15.73 1973 11.48 1974 -3.619 1975 6.58 1976 18.01 1977 11.51 1978 13.04 1979 6.827 1980 4.809 1981 6.878 1982 4.863 1983 10.41 1984 10.41 1985 4.05 1986 16.18 1987 10.24 1988 3.041 1989 9.66 1990 5.475 1991 8.786 1992 6.514 1993 6.999 1994 7.131 1995 5.64 1996 6.545 1997 6.943 1998 5.075 1999 3.875 2000 4.944 2001 -3.116 2002 4.63 2003 2.112 2004 3.785 2005 2.556 2006 2.636 2007 3.268 2008 -5.509 2009 0.1345 2010 7.346 2011 0.1379 2012 1.268 2013 2.017