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 1.423 1822 1.422 1823 1.422 1824 1.422 1825 1.422 1826 1.422 1827 1.422 1828 1.423 1829 1.422 1830 1.423 1831 1.422 1832 1.423 1833 1.422 1834 1.422 1835 1.423 1836 1.423 1837 1.421 1838 1.422 1839 1.423 1840 1.422 1841 1.422 1842 1.422 1843 1.423 1844 1.422 1845 1.423 1846 1.422 1847 1.422 1848 1.422 1849 1.422 1850 1.422 1851 1.422 1852 1.423 1853 1.422 1854 1.422 1855 1.422 1856 1.421 1857 1.422 1858 1.422 1859 1.422 1860 1.422 1861 1.423 1862 1.422 1863 1.422 1864 1.423 1865 1.422 1866 1.422 1867 1.423 1868 1.422 1869 1.422 1870 1.422 1871 1.422 1872 1.422 1873 1.422 1874 1.422 1875 1.423 1876 1.422 1877 1.422 1878 1.422 1879 1.422 1880 1.423 1881 1.422 1882 1.422 1883 1.423 1884 1.422 1885 1.422 1886 1.423 1887 1.422 1888 1.422 1889 1.423 1890 1.421 1891 1.422 1892 1.423 1893 1.422 1894 1.423 1895 1.422 1896 1.423 1897 1.422 1898 1.422 1899 1.422 1900 1.422 1901 1.422 1902 1.422 1903 1.422 1904 1.422 1905 1.422 1906 1.422 1907 1.422 1908 1.422 1909 1.422 1910 1.422 1911 1.422 1912 1.422 1913 1.423 1914 2.257 1915 2.257 1916 2.257 1917 2.257 1918 2.257 1919 2.257 1920 2.257 1921 2.257 1922 2.257 1923 2.257 1924 2.257 1925 2.257 1926 2.257 1927 2.257 1928 2.257 1929 2.257 1930 2.257 1931 2.257 1932 2.257 1933 2.257 1934 2.257 1935 2.257 1936 2.257 1937 2.257 1938 2.257 1939 2.257 1940 2.257 1941 2.257 1942 2.257 1943 2.257 1944 2.257 1945 2.257 1946 2.257 1947 2.257 1948 2.257 1949 2.257 1950 2.257 1951 5.849 1952 5.402 1953 5.183 1954 5.122 1955 5.158 1956 5.235 1957 5.31 1958 5.346 1959 5.323 1960 5.241 1961 5.127 1962 5.023 1963 4.971 1964 4.989 1965 5.025 1966 5.118 1967 5.125 1968 4.861 1969 4.267 1970 3.481 1971 6.318 1972 4.505 1973 3.823 1974 2.644 1975 -9.727 1976 9.634 1977 11.19 1978 6.302 1979 -5.412 1980 -8.577 1981 6.444 1982 -5.229 1983 -5.133 1984 -2.891 1985 13.34 1986 -1.703 1987 -6.902 1988 9.521 1989 5.459 1990 -3.093 1991 3.214 1992 1.614 1993 -4.592 1994 -2.698 1995 3.387 1996 1.587 1997 2.628 1998 3.438 1999 -2.041 2000 4.47 2001 6.498 2002 3.262 2003 7.658 2004 8.145 2005 6.435 2006 5.745 2007 4.997 2008 3.716 2009 2.567 2010 3.687 2011 4.261 2012 5.399 2013 4.512