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 0.9972 1822 0.9973 1823 0.9972 1824 0.9973 1825 0.9972 1826 0.9972 1827 0.9973 1828 0.9972 1829 0.9973 1830 0.9972 1831 0.9973 1832 0.9972 1833 0.9973 1834 0.9972 1835 0.9972 1836 0.9973 1837 0.9972 1838 0.9973 1839 0.9972 1840 0.9973 1841 0.9972 1842 0.9973 1843 0.9972 1844 0.9972 1845 0.9973 1846 0.9972 1847 0.9973 1848 0.9972 1849 0.9973 1850 0.9973 1851 0.9973 1852 0.9972 1853 0.9973 1854 0.9972 1855 0.9972 1856 0.9973 1857 0.9973 1858 0.9972 1859 0.9972 1860 0.9972 1861 0.9973 1862 0.9973 1863 0.9972 1864 0.9973 1865 0.9972 1866 0.9972 1867 0.9973 1868 0.9972 1869 0.9973 1870 0.9972 1871 0.9973 1872 0.9972 1873 0.9972 1874 0.9972 1875 0.9972 1876 0.9973 1877 0.9972 1878 0.9973 1879 0.9972 1880 0.9973 1881 0.9972 1882 0.9973 1883 0.9972 1884 0.9973 1885 0.9972 1886 0.9973 1887 0.9972 1888 0.9973 1889 0.9973 1890 0.9973 1891 0.9972 1892 0.9972 1893 0.9972 1894 0.9972 1895 0.9973 1896 0.9972 1897 0.9973 1898 0.9972 1899 0.9973 1900 0.9972 1901 0.9972 1902 0.9973 1903 0.9972 1904 0.9972 1905 0.9973 1906 0.9972 1907 0.9973 1908 0.9973 1909 0.9972 1910 0.9972 1911 0.9973 1912 0.9973 1913 0.9972 1914 1.191 1915 1.191 1916 1.191 1917 1.191 1918 1.191 1919 1.191 1920 1.191 1921 1.191 1922 1.191 1923 1.191 1924 1.191 1925 1.191 1926 1.191 1927 1.191 1928 1.191 1929 1.191 1930 1.191 1931 1.191 1932 1.191 1933 1.191 1934 1.191 1935 1.191 1936 1.191 1937 1.191 1938 1.191 1939 1.191 1940 1.191 1941 1.191 1942 1.191 1943 1.191 1944 1.191 1945 1.191 1946 1.191 1947 1.191 1948 1.191 1949 1.191 1950 1.191 1951 5.112 1952 4.942 1953 4.788 1954 4.741 1955 4.704 1956 4.593 1957 4.585 1958 4.589 1959 4.605 1960 7.31 1961 5.025 1962 11.5 1963 10.84 1964 1.136 1965 8.462 1966 -0.3999 1967 1.304 1968 1.645 1969 -2.193 1970 3.886 1971 6.478 1972 -4.475 1973 -16.42 1974 9.466 1975 -2.125 1976 1.3 1977 8.371 1978 14.03 1979 7.638 1980 5.218 1981 1.47 1982 -0.99 1983 -1.659 1984 -16.78 1985 1.916 1986 4.747 1987 -3.422 1988 5.834 1989 0.4015 1990 -1.472 1991 2.922 1992 -6.059 1993 1.911 1994 4.538 1995 3.141 1996 4.004 1997 3.54 1998 11.24 1999 0.07177 2000 -0.7789 2001 7.735 2002 3.598 2003 5.078 2004 -0.2504 2005 8.002 2006 5.831 2007 0.6261 2008 9.673 2009 -0.8629 2010 11.21 2011 2.638 2012 11.58 2013 4.031