Year Total 1801 3.078 1802 0.1985 1803 0.1988 1804 0.1992 1805 0.1988 1806 0.1992 1807 0.1988 1808 0.1984 1809 0.1988 1810 0.1991 1811 0.1987 1812 0.1991 1813 0.1987 1814 0.199 1815 0.1986 1816 0.199 1817 0.1986 1818 0.199 1819 0.1986 1820 0.1989 1821 4.537 1822 4.537 1823 4.537 1824 4.538 1825 4.536 1826 4.537 1827 4.537 1828 4.537 1829 4.537 1830 4.537 1831 4.537 1832 4.536 1833 4.537 1834 4.536 1835 4.537 1836 4.537 1837 4.537 1838 4.537 1839 4.537 1840 4.537 1841 4.537 1842 4.537 1843 4.537 1844 4.537 1845 4.537 1846 4.537 1847 4.537 1848 4.537 1849 4.537 1850 4.537 1851 1.999 1852 1.999 1853 1.999 1854 1.999 1855 1.999 1856 1.999 1857 1.998 1858 1.999 1859 1.999 1860 1.999 1861 1.999 1862 1.999 1863 1.999 1864 1.999 1865 1.999 1866 1.999 1867 1.999 1868 1.999 1869 1.999 1870 1.999 1871 1.992 1872 1.992 1873 1.992 1874 1.992 1875 1.992 1876 1.992 1877 1.992 1878 1.992 1879 1.992 1880 1.992 1881 1.992 1882 1.992 1883 1.992 1884 1.992 1885 1.992 1886 1.992 1887 1.992 1888 1.992 1889 1.992 1890 1.992 1891 1.992 1892 1.992 1893 1.992 1894 1.992 1895 1.992 1896 1.992 1897 1.992 1898 1.992 1899 1.992 1900 1.992 1901 3.497 1902 3.449 1903 3.404 1904 3.549 1905 3.313 1906 3.455 1907 3.587 1908 3.361 1909 3.49 1910 3.442 1911 3.396 1912 3.513 1913 3.464 1914 2.497 1915 2.634 1916 2.466 1917 2.6 1918 2.437 1919 2.568 1920 2.551 1921 1.091 1922 8.738 1923 -0.5952 1924 -6.587 1925 20.73 1926 0.885 1927 9.825 1928 12.46 1929 -0.9943 1930 6.528 1931 2.155 1932 -10.42 1933 -6.181 1934 -3.137 1935 -4.453 1936 1.78 1937 -4.413 1938 5.836 1939 2.798 1940 6.805 1941 -0.2249 1942 -8.565 1943 0.1643 1944 2.297 1945 23.18 1946 7.617 1947 6.473 1948 2.102 1949 1.391 1950 7.205 1951 4.962 1952 3.737 1953 7.924 1954 -5.726 1955 2.516 1956 7.923 1957 4.424 1958 2.945 1959 2.369 1960 6.085 1961 2.46 1962 5.599 1963 3.457 1964 4.748 1965 8.009 1966 5.05 1967 4.741 1968 4.935 1969 -0.1546 1970 2.518 1971 3.199 1972 2.891 1973 4.078 1974 13.67 1975 2.252 1976 10.18 1977 10.35 1978 9.659 1979 4.417 1980 -0.0136 1981 1.628 1982 -2.079 1983 -1.006 1984 3.481 1985 3.873 1986 0.304 1987 5.463 1988 4.673 1989 3.568 1990 -0.04591 1991 2.613 1992 5.585 1993 6.774 1994 -2.295 1995 3.197 1996 3.052 1997 4.433 1998 2.442 1999 -2.372 2000 4.292 2001 2.075 2002 2.252 2003 3.029 2004 4.614 2005 3.819 2006 6.492 2007 6.11 2008 4.156 2009 -2.499 2010 3.667 2011 3.655 2012 3.845 2013 2.529