Year Jan Feb
1874 6.41 4.48
1875 4.18 2.43
1876 5.43 4.18
1877 3.38 1.89
1878 5.47 3.81
1879 5.24 4.19
1880 4.57 2.90
1881 3.46 2.13
1882 7.07 5.36
1883 6.48 5.25
1884 4.45 3.01
1885 4.55 3.06
1886 4.66 3.46
1887 5.16 4.09
1888 4.81 3.33
1889 3.77 2.33
1890 4.64 3.04
1891 5.12 3.18
1892 2.86 1.70
1893 4.09 2.41
1894 5.24 3.19
1895 4.84 3.17
1896 6.14 4.80
1897 5.01 3.29
1898 6.25 4.67
1899 5.93 4.48
1900 6.44 4.54
1901 4.34 3.10
1902 5.58 4.31
1903 1.94 1.23
1904 3.84 2.39
1905 3.38 1.96
1906 3.62 2.24
1907 4.50 3.43
1908 3.85 2.50
1909 3.69 2.68
1910 4.29 2.89
1911 3.60 2.25
1912 4.53 3.43
1913 5.00 3.89
1914 4.34 3.20
1915 2.76 2.21
1916 2.89 1.91
1917 1.64 1.23
1918 3.98 2.74
1919 3.49 2.30
1920 4.74 3.79
1921 4.80 3.92
1922 3.28 2.42
1923 2.88 1.95
1924 3.28 2.16
1925 2.91 1.85
1926 3.14 2.01
1927 3.57 2.32
1928 3.25 2.14
1929 2.97 1.92
1930 3.60 2.50
1931 2.41 1.54
1932 3.28 2.18
1933 3.66 2.49
1934 2.46 1.67
1935 3.05 1.97
1936 3.84 3.14
1937 3.89 2.56
1938 3.77 2.62
1939 3.46 2.52
1940 3.11 2.15
1941 3.36 2.15
1942 4.02 3.28
1943 3.13 1.93
1944 2.24 1.53
1945 3.33 2.13
1946 3.15 1.89
1947 2.80 1.81
1948 2.65 1.68
1949 3.82 2.53
1950 4.33 3.67
1951 3.71 2.77
1952 3.66 2.89
1953 3.94 3.00
1954 3.63 2.28
1955 3.23 1.91
1956 2.76 1.73
1957 3.12 1.75
1958 4.11 2.90
1959 3.59 2.89
1960 4.02 3.44
1961 2.63 1.80
1962 3.58 2.36
1963 3.68 2.64
1964 3.06 1.84
1965 4.34 3.37
1966 4.03 3.22
1967 5.13 3.96
1968 6.13 5.67
1969 4.58 3.61
1970 4.61 3.76
1971 4.94 4.28
1972 3.91 3.13
1973 4.03 3.19
1974 4.64 3.62
1975 4.45 3.73
1976 2.89 2.45
1977 3.57 2.57
1978 4.18 3.17
1979 4.71 3.93
1980 4.12 2.93
1981 5.76 3.53
1982 4.71 3.55
1983 3.63 2.82
1984 3.74 2.78
1985 3.94 2.85
1986 3.47 2.91
1987 3.88 4.01
1988 3.70 3.12