Year! nine fourteen 1856 5.63 NA 1857 6.27 NA 1858 6.60 5.39 1859 5.76 6.13 1860 5.12 5.03 1861 5.91 5.59 1862 5.67 5.09 1863 5.60 6.06 1864 5.04 6.03 1865 3.63 4.97 1866 4.67 6.24 1867 4.92 6.50 1868 6.25 7.27 1869 7.12 7.98 1870 3.07 5.97 1871 6.04 6.47 1872 5.17 5.85 1873 4.61 5.50 1874 2.52 4.53 1875 5.08 5.96 1876 5.08 6.75 1877 5.31 5.96 1878 5.98 5.01 1879 6.23 5.32 1880 3.78 4.75 1881 2.87 3.43 1882 6.58 6.10 1883 3.89 4.06 1884 5.55 5.45 1885 4.30 5.14 1886 4.36 4.01 1887 3.15 4.86 1888 3.70 4.74 1889 5.13 4.48 1890 4.09 4.99 1891 5.04 5.56 1892 3.62 4.47 1893 0.92 2.28 1894 5.38 5.45 1895 4.52 4.87 1896 2.18 4.03 1897 4.91 4.68 1898 5.38 5.26 1899 4.73 5.61 1900 3.46 5.13 1901 2.47 3.59 1902 4.88 5.35 1903 5.19 5.57 1904 6.11 6.01 1905 4.81 3.88 1906 4.08 4.44 1907 6.26 4.91 1908 4.93 5.45 1909 2.84 4.17 1910 3.81 4.06 1911 4.31 4.79 1912 1.85 3.75 1913 4.71 5.53 1914 2.66 4.42 1915 0.85 4.84 1916 3.63 4.14 1917 2.54 4.13 1918 3.34 4.45 1919 3.12 4.73 1920 3.18 5.95 1921 4.36 4.87 1922 0.54 4.08 1923 4.49 4.82 1924 3.30 5.76 1925 4.05 5.28 1926 3.88 5.19 1927 2.47 3.67 1928 2.97 5.08 1929 0.09 3.94 1930 3.40 6.64 1931 5.96 6.05 1932 7.01 5.00 1933 4.78 5.05 1934 3.63 5.81 1935 5.20 5.34 1936 3.45 4.95 1937 4.30 4.05 1938 1.01 4.30 1939 2.87 4.87 1940 3.70 4.66 1941 1.62 4.92 1942 3.83 4.30 1943 5.56 4.72 1944 2.29 3.22 1945 3.82 4.83 1946 1.18 3.91 1947 1.45 4.10 1948 3.11 4.83 1949 3.60 4.38 1950 3.83 3.94 1951 5.11 5.14 1952 4.46 5.43 1953 3.79 5.33 1954 0.60 4.36 1955 1.91 4.69 1956 3.36 3.87 1957 4.34 5.44 1958 3.83 4.96 1959 1.53 5.19 1960 5.31 5.25 1961 5.44 5.46 1962 4.11 5.76 1963 4.63 5.66 1964 5.08 5.09 1965 7.07 5.36 1966 5.65 5.76 1967 4.74 4.83 1968 4.97 5.74 1969 2.14 5.69 1970 4.02 6.18 1971 5.93 6.45 1972 6.25 6.75 1973 4.48 8.03 1974 4.56 6.35 1975 3.98 4.63 1976 2.37 4.95 1977 4.34 5.90 1978 4.97 4.86 1979 3.07 3.65 1980 2.25 5.84 1981 4.37 5.14 1982 4.59 5.43 1983 3.51 4.91 1984 2.84 4.57 1985 5.08 5.32 1986 2.78 4.93 1987 4.78 5.10 1988 2.65 4.98 1989 1.51 4.34 1990 1.48 4.82 1991 6.26 5.04 1992 3.48 5.93 1993 4.18 5.26 1994 6.19 4.88 1995 1.45 5.15 1996 1.93 4.72 1997 3.03 3.67 1998 4.81 4.93 1999 5.41 3.63 2000 5.82 4.21 2001 2.55 5.88 2002 6.48 5.47 2003 4.82 5.10 2004 4.38 5.22