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 0.383 1822 0.383 1823 0.383 1824 0.3829 1825 0.383 1826 0.383 1827 0.383 1828 0.383 1829 0.383 1830 0.383 1831 0.383 1832 0.383 1833 0.383 1834 0.383 1835 0.383 1836 0.383 1837 0.383 1838 0.383 1839 0.383 1840 0.383 1841 0.383 1842 0.383 1843 0.383 1844 0.383 1845 0.383 1846 0.383 1847 0.383 1848 0.383 1849 0.383 1850 0.383 1851 0.3837 1852 0.3837 1853 0.3837 1854 0.3837 1855 0.3837 1856 0.3837 1857 0.3837 1858 0.3837 1859 0.3837 1860 0.3837 1861 0.3837 1862 0.3837 1863 0.3837 1864 0.3837 1865 0.3837 1866 0.3837 1867 0.3837 1868 0.3837 1869 0.3837 1870 0.3837 1871 3.97 1872 3.97 1873 3.97 1874 3.97 1875 3.97 1876 3.97 1877 3.97 1878 3.97 1879 3.97 1880 3.97 1881 3.97 1882 3.97 1883 3.97 1884 3.97 1885 3.97 1886 3.97 1887 3.97 1888 3.97 1889 3.97 1890 3.97 1891 4.205 1892 4.205 1893 4.205 1894 4.205 1895 4.205 1896 4.205 1897 4.205 1898 4.205 1899 4.205 1900 4.205 1901 4.199 1902 -2.729 1903 -2.731 1904 -2.724 1905 -2.727 1906 -2.729 1907 2.853 1908 2.85 1909 2.846 1910 2.851 1911 2.847 1912 7.404 1913 7.007 1914 7.204 1915 7.205 1916 7.205 1917 -2.031 1918 -2.031 1919 -2.71 1920 -1.347 1921 -2.015 1922 3.817 1923 3.813 1924 3.818 1925 3.814 1926 3.818 1927 3.164 1928 3.167 1929 3.163 1930 3.166 1931 3.162 1932 -0.09981 1933 -0.1052 1934 -0.104 1935 -0.1032 1936 -0.1026 1937 -4.765 1938 -4.765 1939 -3.747 1940 -3.748 1941 -3.743 1942 -15.46 1943 -15.46 1944 -15.46 1945 0.4821 1946 0.9793 1947 0.9793 1948 0.9793 1949 0.9793 1950 0.9793 1951 14.83 1952 2.505 1953 3.003 1954 -5.821 1955 13.53 1956 7.123 1957 6.411 1958 -2.262 1959 16.05 1960 3.787 1961 2.852 1962 9.14 1963 3.21 1964 2.158 1965 2.928 1966 -3.801 1967 3.21 1968 7.006 1969 4.58 1970 5.008 1971 3.785 1972 1.269 1973 0.1958 1974 5.827 1975 4.737 1976 6.631 1977 6.47 1978 7.19 1979 5.122 1980 8.588 1981 5.83 1982 5.49 1983 4.298 1984 4.82 1985 2.778 1986 -1.071 1987 -3.969 1988 -11.2 1989 3.956 1990 3.043 1991 -0.4287 1992 3.918 1993 2.807 1994 3.102 1995 2.969 1996 2.893 1997 2.733 1998 2.699 1999 4.045 2000 4.654 2001 3.746 2002 3.763 2003 4.168 2004 3.811 2005 0.04191 2006 11.53 2007 10.52 2008 2.281 2009 3.837 2010 4.053 2011 4.187 2012 6.04 2013 6.247