| YEAR | JAN | FEB | MAR | APRIL | MAY | JUNE | JULY | AUG | SEPT | OCT | NOV | DEC | Year Avg |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1863 | - | - | - | 1.74 | 4.50 | 2.31 | 3.82 | 3.03 | 0.89 | 1.05 | 0.41 | 1.81 | 19.56 |
| 1864 | 0.94 | 0.32 | 2.26 | 3.79 | 2.87 | 3.88 | 1.24 | 0.40 | 3.40 | 1.85 | 4.11 | 3.29 | 28.35 |
| 1865 | 0.65 | 1.76 | 2.79 | 2.31 | 1.76 | 3.66 | 3.90 | 3.38 | 4.79 | 2.79 | 0.68 | 1.43 | 29.90 |
| 1866 | 2.08 | 2.28 | 3.39 | 1.41 | 3.47 | 5.38 | 4.18 | 3.44 | 5.79 | 3.56 | 2.60 | 1.90 | 39.48 |
| 1867 | 1.68 | 3.23 | 0.68 | 2.19 | 3.81 | 2.83 | 1.76 | 1.74 | 1.42 | 2.10 | 1.76 | 1.34 | 24.54 |
| 1868 | 1.47 | 1.28 | 4.64 | 1.83 | 2.88 | 3.55 | 1.11 | 2.42 | 2.96 | 1.10 | 2.53 | 1.35 | 27.12 |
| 1869 | 0.87 | 2.95 | 1.65 | 2.34 | 2.05 | 4.38 | 5.77 | 4.85 | 1.43 | 1.73 | 1.93 | 2.16 | 32.11 |
| 1870 | 1.93 | 1.21 | 3.21 | 2.02 | 1.16 | 7.26 | 8.02 | 4.53 | 2.85 | 2.29 | 0.91 | 3.07 | 38.46 |
| 1871 | 4.35 | 1.73 | 3.30 | 2.97 | 1.97 | 2.93 | 3.10 | 1.42 | 0.79 | 1.43 | 1.25 | 2.01 | 27.25 |
| 1872 | 0.83 | 0.49 | 2.14 | 1.26 | 3.72 | 3.45 | 3.36 | 4.18 | 5.20 | 0.67 | 0.98 | 1.16 | 27.44 |
| 1873 | 2.98 | 0.87 | 1.88 | 3.86 | 3.05 | 2.96 | 5.12 | 0.80 | 3.50 | 1.91 | 2.02 | 3.02 | 31.97 |
| 1874 | 3.53 | 1.55 | 1.79 | 1.66 | 1.78 | 5.07 | 2.56 | 1.28 | 1.26 | 0.49 | 1.55 | 0.45 | 22.97 |
| 1875 | 1.23 | 2.20 | 2.62 | 0.61 | 4.46 | 3.21 | 2.42 | 1.47 | 2.89 | 5.71 | 1.11 | 2.54 | 30.47 |
| 1876 | 1.63 | 3.04 | 4.84 | 2.08 | 4.12 | 4.34 | 2.10 | 1.28 | 3.65 | 1.26 | 0.91 | 1.29 | 30.54 |
| 1877 | 1.33 | - | 5.59 | 4.14 | 2.23 | 3.53 | 2.25 | 6.56 | 1.38 | 5.69 | 3.72 | 1.03 | 37.45 |
| 1878 | 1.47 | 2.39 | 3.12 | 3.76 | 3.44 | 3.15 | 2.96 | 1.85 | 3.43 | 1.99 | 2.16 | 2.27 | 31.99 |
| 1879 | 0.49 | 1.43 | 1.57 | 1.25 | 2.45 | 2.87 | 2.19 | 1.61 | 3.19 | 1.57 | 4.54 | 3.53 | 26.69 |
| 1880 | 2.67 | 1.62 | 1.70 | 6.40 | 5.59 | 5.04 | 6.11 | 5.02 | 3.10 | 2.50 | 2.22 | 0.85 | 42.82 |
| 1881 | 2.34 | 3.77 | 2.66 | 1.73 | 2.11 | 4.37 | 1.81 | 1.63 | 2.90 | 5.18 | 4.09 | 1.75 | 34.34 |
| 1882 | 1.46 | 2.28 | 3.58 | 1.88 | 4.04 | 5.56 | 2.32 | 5.71 | 0.67 | 2.64 | 1.83 | 0.93 | 32.90 |
| 1883 | 1.53 | 4.50 | 0.71 | 1.90 | 5.65 | 11.35 | 11.25 | 0.18 | 2.34 | 3.66 | 3.98 | 1.36 | 48.41 |
| 1884 | 1.38 | 3.69 | 3.67 | 1.95 | 3.95 | 2.83 | 2.60 | 1.30 | 3.34 | 5.73 | 2.44 | 3.73 | 36.61 |
| 1885 | 2.70 | 0.73 | 0.98 | 2.47 | 2.30 | 6.01 | 2.52 | 5.81 | 3.75 | 3.08 | 2.90 | 2.14 | 35.39 |
| 1886 | 2.66 | 1.35 | 2.62 | 1.99 | 2.67 | 1.92 | 0.65 | 4.68 | 5.40 | 0.95 | 1.48 | 1.76 | 28.13 |
| 1887 | 3.25 | 5.71 | 1.78 | 0.90 | 2.42 | 2.46 | 1.50 | 0.89 | 4.72 | 1.86 | 2.28 | 3.32 | 31.09 |
| 1888 | 2.18 | 1.75 | 1.88 | 1.15 | 3.66 | 2.51 | 2.40 | 1.87 | 1.89 | 3.00 | 3.12 | 1.30 | 26.71 |
| 1889 | 1.53 | 1.17 | 1.22 | 2.02 | 3.61 | 3.71 | 3.41 | 0.68 | 0.79 | 0.65 | 2.66 | 2.61 | 24.06 |
| 1890 | 2.30 | 1.79 | 1.54 | 3.20 | 4.97 | 3.92 | 0.92 | 3.60 | 1.67 | 4.57 | 2.30 | 1.12 | 31.90 |
| 1891 | 0.82 | 2.19 | 2.41 | 1.74 | 1.63 | 2.55 | 2.80 | 4.83 | 1.10 | 0.82 | 3.34 | 1.47 | 25.70 |
| 1892 | 0.96 | 1.94 | 1.31 | 2.04 | 5.92 | 4.33 | 2.00 | 5.12 | 2.17 | 0.78 | 1.84 | 1.52 | 29.93 |
| 1893 | 1.78 | 1.83 | 2.82 | 4.81 | 2.86 | 4.85 | 1.86 | 0.56 | 1.84 | 3.61 | 2.19 | 2.28 | 31.29 |
| 1894 | 1.50 | 0.58 | 1.25 | 2.76 | 4.83 | 1.30 | 0.86 | 0.00 | 2.59 | 1.91 | 0.97 | 0.93 | 19.48 |
| 1895 | 1.77 | 0.72 | 1.26 | 0.67 | 2.05 | 1.01 | 1.47 | 4.63 | 0.85 | 1.41 | 3.86 | 6.91 | 26.61 |
| 1896 | 0.94 | 1.51 | 1.31 | 2.68 | 3.14 | 2.60 | 6.73 | 4.73 | 6.73 | 1.06 | 1.05 | 0.90 | 33.38 |
| 1897 | 4.17 | 0.67 | 3.24 | 2.74 | 3.75 | 2.57 | 8.48 | 1.69 | 0.80 | 2.15 | 2.84 | 2.02 | 35.12 |
| 1898 | 3.07 | 1.82 | 3.59 | 2.12 | 2.15 | 4.44 | 1.34 | 2.73 | 3.00 | 3.55 | 2.72 | 1.42 | 31.95 |
| 1899 | 2.16 | 1.51 | 4.08 | 1.56 | 3.59 | 1.15 | 2.11 | 0.70 | 2.14 | 2.68 | 1.72 | 1.51 | 24.91 |
| 1900 | 1.17 | 3.44 | 1.88 | 2.00 | 4.17 | 2.57 | 4.15 | 2.98 | 0.89 | 2.77 | 5.10 | 0.50 | 31.62 |
| 1901 | 1.53 | 1.83 | 2.94 | 2.16 | 2.42 | 3.57 | 5.08 | 2.49 | 1.67 | 4.61 | 1.21 | 3.00 | 32.51 |
| 1902 | 0.43 | 0.44 | 3.16 | 1.78 | 4.92 | 7.28 | 7.12 | 0.68 | 5.87 | 1.53 | 2.45 | 2.91 | 38.57 |
| 1903 | 1.60 | 1.58 | 1.25 | 4.40 | 2.63 | 6.28 | 3.79 | 6.73 | 2.86 | 2.00 | 1.45 | 1.35 | 35.92 |
| 1904 | 3.43 | 3.30 | 3.46 | 1.30 | 2.40 | 2.49 | 1.96 | 3.26 | 2.35 | 1.90 | 0.04 | 1.42 | 27.31 |
| 1905 | 1.07 | 1.25 | 2.65 | 2.64 | 5.17 | 7.47 | 5.14 | 3.92 | 3.21 | 1.75 | 2.25 | 2.54 | 39.06 |
| 1906 | 1.99 | 1.13 | 2.62 | 2.30 | 3.05 | 4.50 | 2.23 | 4.34 | 0.76 | 2.36 | 1.06 | 1.84 | 28.18 |
| 1907 | 3.96 | 0.25 | 2.84 | 2.81 | 2.22 | 2.37 | 4.30 | 2.87 | 4.67 | 2.22 | 1.83 | 4.19 | 34.53 |
| 1908 | 1.89 | 3.18 | 2.19 | 2.14 | 5.59 | 1.23 | 1.02 | 3.98 | 0.65 | 0.82 | 1.82 | 2.08 | 26.59 |
| 1909 | 2.16 | 2.35 | 0.90 | 5.95 | 2.43 | 2.86 | 2.55 | 1.61 | 1.51 | 0.61 | 3.73 | 2.51 | 29.17 |
| 1910 | 2.52 | 2.65 | 0.40 | 2.48 | 4.13 | 1.95 | 1.53 | 1.76 | 2.74 | 2.27 | 1.37 | 1.28 | 25.08 |
| 1911 | 1.43 | 1.77 | 1.21 | 2.11 | 2.67 | 3.77 | 1.65 | 1.48 | 5.05 | 5.00 | 3.40 | 1.58 | 31.12 |
| 1912 | 0.80 | 2.03 | 1.92 | 3.12 | 6.57 | 0.97 | 5.06 | 2.19 | 3.33 | 3.43 | 2.85 | 1.20 | 33.47 |
| 1913 | 3.09 | 1.65 | 3.76 | 3.10 | 2.22 | 1.00 | 2.84 | 5.60 | 1.53 | 3.30 | 2.38 | 0.55 | 31.02 |
| 1914 | 2.98 | 0.79 | 1.52 | 2.90 | 4.66 | 4.11 | 1.65 | 3.32 | 2.65 | 2.81 | 1.40 | 1.57 | 30.36 |
| 1915 | 1.54 | 2.08 | 0.78 | 1.00 | 2.74 | 3.96 | 5.17 | 4.63 | 6.55 | 0.70 | 2.23 | 1.01 | 32.39 |
| 1916 | 3.11 | 0.69 | 3.08 | 1.91 | 5.12 | 5.39 | 0.09 | 1.58 | 2.17 | 2.53 | 1.68 | 2.11 | 29.46 |
| 1917 | 1.55 | 0.62 | 2.87 | 5.59 | 3.37 | 4.54 | 3.06 | 1.47 | 4.60 | 3.44 | 0.82 | 0.74 | 32.67 |
| 1918 | 2.08 | 3.03 | 3.58 | 1.97 | 2.89 | 2.07 | 1.96 | 1.44 | 2.88 | 3.21 | 3.22 | 3.61 | 31.94 |
| 1919 | 0.36 | 1.50 | 3.48 | 4.12 | 4.29 | 3.18 | 1.69 | 4.03 | 2.61 | 2.90 | 2.44 | 0.86 | 31.46 |
| 1920 | 1.34 | 0.81 | 3.57 | 3.25 | 1.43 | 4.17 | 3.01 | 2.00 | 1.26 | 1.36 | 2.29 | 3.94 | 28.43 |
| 1921 | 0.41 | 1.25 | 3.34 | 3.80 | 1.33 | 3.24 | 2.61 | 5.18 | 2.64 | 2.85 | 4.06 | 3.54 | 34.25 |
| 1922 | 1.23 | 0.97 | 3.68 | 3.75 | 3.39 | 1.83 | 2.57 | 2.42 | 2.93 | 2.48 | 1.79 | 1.03 | 28.07 |
| 1923 | 1.65 | 1.01 | 3.04 | 1.56 | 3.45 | 2.89 | 4.76 | 1.27 | 5.60 | 1.39 | 1.48 | 2.96 | 31.06 |
| 1924 | 1.83 | 2.13 | 1.78 | 2.46 | 4.20 | 4.93 | 2.68 | 2.01 | 2.58 | 0.30 | 0.89 | 1.97 | 27.76 |
| 1925 | 0.90 | 1.84 | 2.45 | 1.86 | 0.70 | 2.02 | 3.40 | 2.15 | 3.88 | 4.25 | 3.11 | 1.15 | 27.71 |
| 1926 | 1.88 | 3.46 | 3.13 | 2.50 | 2.38 | 2.90 | 1.49 | 2.61 | 3.70 | 2.24 | 2.93 | 1.58 | 30.80 |
| 1927 | 1.21 | 1.34 | 1.55 | 3.16 | 3.61 | 1.49 | 2.11 | 0.21 | 4.67 | 1.88 | 4.69 | 3.11 | 29.03 |
| 1928 | 1.50 | 1.60 | 2.43 | 1.81 | 4.47 | 3.12 | 1.89 | 2.79 | 2.14 | 3.96 | 4.06 | 1.81 | 31.58 |
| 1929 | 3.41 | 0.96 | 3.15 | 5.54 | 3.97 | 2.17 | 1.89 | 0.29 | 1.23 | 4.09 | 1.42 | 3.22 | 31.34 |
| 1930 | 2.53 | 1.41 | 1.47 | 1.97 | 3.36 | 2.79 | 0.50 | 0.18 | 1.42 | 1.00 | 0.96 | 0.91 | 18.50 |
| 1931 | 1.34 | 0.99 | 2.10 | 1.87 | 3.71 | 3.73 | 0.91 | 1.70 | 3.33 | 1.80 | 3.35 | 3.79 | 28.62 |
| 1932 | 2.85 | 1.74 | 2.09 | 2.18 | 5.02 | 1.24 | 3.44 | 3.71 | 3.04 | 4.97 | 1.42 | 2.49 | 34.19 |
| 1933 | 1.43 | 1.71 | 2.25 | 3.35 | 3.95 | 2.56 | 1.43 | 2.14 | 5.37 | 3.41 | 2.56 | 1.50 | 31.66 |
| 1934 | 1.05 | 0.37 | 1.88 | 2.68 | 1.33 | 1.66 | 2.14 | 1.51 | 2.21 | 1.53 | 2.85 | 1.77 | 20.98 |
| 1935 | 1.90 | 1.99 | 3.28 | 1.60 | 3.87 | 4.95 | 2.60 | 2.69 | 2.49 | 0.66 | 3.75 | 1.49 | 31.27 |
| 1936 | 1.78 | 1.62 | 0.83 | 3.37 | 0.78 | 2.97 | 1.22 | 2.42 | 7.76 | 2.24 | 0.66 | 1.99 | 27.64 |
| 1937 | 2.05 | 1.02 | 1.17 | 6.33 | 3.42 | 6.76 | 1.64 | 4.42 | 1.27 | 1.65 | 2.29 | 1.54 | 33.56 |
| 1938 | 1.31 | 7.46 | 3.35 | 1.42 | 5.72 | 2.89 | 1.50 | 4.24 | 1.64 | 0.37 | 0.39 | 2.07 | 32.36 |
| 1939 | 2.34 | 3.15 | 1.54 | 4.21 | 2.07 | 3.77 | 1.60 | 1.97 | 1.41 | 3.60 | 0.65 | 0.89 | 27.20 |
| 1940 | 1.35 | 0.82 | 2.07 | 1.42 | 4.66 | 5.70 | 1.84 | 9.21 | 1.42 | 3.57 | 3.11 | 2.66 | 37.83 |
| 1941 | 1.58 | 0.86 | 1.67 | 2.44 | 3.28 | 3.70 | 0.80 | 2.86 | 2.96 | 7.32 | 2.96 | 1.83 | 32.26 |
| 1942 | 2.15 | 0.84 | 4.70 | 0.88 | 5.24 | 4.48 | 4.32 | 2.35 | 2.16 | 3.35 | 3.45 | 3.05 | 36.97 |
| 1943 | 2.99 | 1.43 | 3.02 | 2.81 | 7.97 | 3.85 | 3.87 | 2.68 | 3.45 | 1.80 | 2.15 | 0.45 | 36.47 |
| 1944 | 1.32 | 2.15 | 2.99 | 2.45 | 4.36 | 2.50 | 1.03 | 2.39 | 2.50 | 0.65 | 1.91 | 1.61 | 25.86 |
| 1945 | 0.55 | 1.34 | 2.54 | 3.48 | 7.42 | 3.70 | 2.08 | 6.31 | 6.57 | 2.56 | 1.11 | 1.28 | 38.94 |
| 1946 | 1.65 | 2.22 | 2.43 | 0.82 | 3.93 | 2.48 | 0.25 | 0.88 | 1.76 | 2.14 | 1.88 | 3.06 | 23.50 |
| 1947 | 3.39 | 0.84 | 2.81 | 6.39 | 5.22 | 2.74 | 3.06 | 3.86 | 4.75 | 2.68 | 1.99 | 2.00 | 39.73 |
| 1948 | 1.33 | 1.44 | 4.25 | 2.93 | 4.69 | 3.10 | 1.65 | 1.86 | 1.62 | 1.01 | 2.49 | 2.23 | 28.60 |
| 1949 | 3.49 | 2.47 | 2.61 | 1.87 | 2.35 | 4.89 | 4.78 | 1.61 | 1.91 | 2.40 | 1.60 | 4.70 | 34.68 |
| 1950 | 3.61 | 3.34 | 2.39 | 4.53 | 1.96 | 4.71 | 4.34 | 2.45 | 3.02 | 1.22 | 2.97 | 1.97 | 36.51 |
| 1951 | 2.52 | 1.85 | 1.67 | 2.93 | 3.08 | 3.26 | 1.07 | 2.67 | 2.59 | 4.17 | 2.63 | 3.09 | 31.53 |
| 1952 | 1.86 | 1.64 | 2.22 | 3.32 | 4.98 | 1.46 | 3.24 | 3.30 | 1.54 | 0.35 | 3.38 | 1.84 | 29.13 |
| 1953 | 2.02 | 1.03 | 2.29 | 2.88 | 1.75 | 2.87 | 1.03 | 3.80 | 1.40 | 1.43 | 0.84 | 1.48 | 22.82 |
| 1954 | 1.61 | 4.21 | 3.26 | 2.75 | 1.14 | 4.07 | 2.08 | 1.43 | 2.24 | 4.88 | 1.97 | 2.71 | 32.35 |
| 1955 | 1.47 | 1.44 | 2.97 | 1.56 | 1.53 | 3.81 | 3.99 | 4.08 | 1.29 | 3.06 | 3.78 | 0.78 | 29.76 |
| 1956 | 0.80 | 2.84 | 2.76 | 4.27 | 5.60 | 1.80 | 2.69 | 3.07 | 0.53 | 0.28 | 1.24 | 1.47 | 27.35 |
| 1957 | 0.88 | 1.38 | 2.08 | 3.72 | 5.17 | 2.88 | 7.55 | 1.29 | 0.78 | 3.73 | 2.75 | 2.20 | 34.41 |
| 1958 | 1.13 | 0.57 | 0.43 | 1.53 | 1.57 | 2.30 | 4.02 | 3.49 | 2.70 | 1.91 | 1.55 | 0.59 | 21.79 |
| 1959 | 2.82 | 2.04 | 2.41 | 3.73 | 2.22 | 1.15 | 5.08 | 3.86 | 2.55 | 4.99 | 2.97 | 2.23 | 36.05 |
| 1960 | 2.87 | 2.65 | 0.92 | 2.80 | 3.05 | 2.95 | 2.25 | 2.98 | 1.39 | 1.41 | 1.56 | 0.37 | 25.20 |
| 1961 | 0.45 | 1.60 | 2.87 | 3.45 | 1.00 | 2.97 | 2.28 | 3.33 | 4.61 | 1.58 | 1.77 | 1.44 | 27.35 |
| 1962 | 2.83 | 1.60 | 1.00 | 1.38 | 1.91 | 2.91 | 2.05 | 1.60 | 2.26 | 1.86 | 0.51 | 1.32 | 21.23 |
| 1963 | 1.02 | 0.39 | 2.12 | 1.95 | 1.97 | 6.09 | 3.48 | 2.84 | 1.69 | 0.55 | 1.33 | 0.93 | 24.36 |
| 1964 | 1.31 | 0.47 | 2.79 | 3.24 | 2.69 | 2.79 | 3.07 | 3.95 | 1.90 | 0.65 | 1.92 | 1.62 | 26.40 |
| 1965 | 3.17 | 2.28 | 3.17 | 2.04 | 1.01 | 2.18 | 0.50 | 3.68 | 7.63 | 0.99 | 1.85 | 3.54 | 32.04 |
| 1966 | 0.87 | 1.52 | 2.40 | 3.01 | 1.88 | 2.56 | 1.59 | 2.38 | 1.22 | 0.88 | 4.60 | 2.46 | 25.37 |
| 1967 | 2.18 | 1.41 | 1.16 | 3.81 | 1.05 | 6.77 | 1.15 | 2.90 | 2.53 | 3.45 | 2.27 | 3.45 | 32.13 |
| 1968 | 1.46 | 1.56 | 1.49 | 2.96 | 4.16 | 7.94 | 3.03 | 2.98 | 2.73 | 1.56 | 3.26 | 2.62 | 35.75 |
| 1969 | 1.91 | 0.22 | 1.06 | 4.02 | 4.47 | 4.03 | 4.89 | 0.17 | 1.67 | 2.74 | 2.32 | 0.53 | 28.03 |
| 1970 | 0.91 | 0.66 | 2.20 | 3.13 | 2.89 | 3.02 | 3.37 | 2.36 | 4.61 | 3.77 | 2.85 | 2.48 | 32.25 |
| 1971 | 0.68 | 2.40 | 2.33 | 1.50 | 1.93 | 5.13 | 4.82 | 2.50 | 5.25 | 2.29 | 1.61 | 4.24 | 34.68 |
| 1972 | 1.51 | 1.19 | 2.82 | 4.56 | 2.86 | 3.28 | 3.27 | 5.06 | 2.65 | 3.30 | 2.72 | 4.16 | 37.38 |
| 1973 | 1.17 | 1.44 | 3.59 | 2.22 | 3.78 | 3.62 | 2.04 | 1.77 | 2.81 | 2.07 | 4.22 | 3.09 | 31.82 |
| 1974 | 3.00 | 2.58 | 4.36 | 2.07 | 4.07 | 2.81 | 1.21 | 2.67 | 2.60 | 1.44 | 2.50 | 2.39 | 31.70 |
| 1975 | 2.77 | 2.08 | 2.43 | 4.76 | 2.96 | 2.93 | 2.47 | 9.81 | 1.65 | 0.95 | 3.43 | 3.32 | 39.56 |
| 1976 | 1.59 | 2.54 | 3.85 | 3.55 | 2.52 | 4.50 | 2.56 | 0.58 | 1.66 | 2.32 | 1.02 | 0.96 | 27.65 |
| 1977 | 0.95 | 0.66 | 2.65 | 2.53 | 0.62 | 3.50 | 2.00 | 1.60 | 4.46 | 1.20 | 2.17 | 2.30 | 24.64 |
| 1978 | 2.60 | 0.46 | 1.91 | 1.55 | 2.06 | 2.73 | 1.23 | 3.69 | 3.80 | 1.98 | 2.58 | 2.85 | 27.44 |
| 1979 | 2.13 | 0.56 | 1.78 | 2.69 | 1.35 | 5.53 | 1.86 | 2.30 | 0.00 | 1.99 | 3.25 | 2.30 | 25.74 |
| 1980 | 0.70 | 0.99 | 1.94 | 2.41 | 1.84 | 3.20 | 3.56 | 4.76 | 3.22 | 2.02 | 0.90 | 3.06 | 28.60 |
| 1981 | 0.39 | 1.39 | 1.10 | 5.16 | 4.69 | 3.22 | 1.71 | 1.98 | 8.01 | 1.28 | 1.50 | 1.10 | 31.53 |
| 1982 | 1.55 | 0.55 | 2.98 | 1.07 | 2.52 | 3.00 | 3.00 | 1.99 | 3.51 | 0.43 | 4.21 | 3.54 | 28.35 |
| 1983 | 1.00 | 0.81 | 3.25 | 4.10 | 3.97 | 4.27 | 2.54 | 2.70 | 3.74 | 2.57 | 3.22 | 1.83 | 34.00 |
| 1984 | 0.49 | 0.89 | 2.54 | 3.02 | 4.05 | 0.32 | 2.64 | 3.16 | 2.69 | 3.09 | 2.54 | 3.79 | 29.22 |
| 1985 | 2.04 | 3.03 | 3.53 | 2.90 | 2.14 | 2.17 | 3.06 | 4.36 | 3.34 | 3.25 | 3.08 | 1.29 | 34.19 |
| 1986 | 0.89 | 2.62 | 1.56 | 1.96 | 1.97 | 10.21 | 1.69 | 2.88 | 8.34 | 2.66 | 1.21 | 1.13 | 37.12 |
| 1987 | 1.00 | 0.35 | 0.97 | 1.58 | 1.37 | 3.30 | 3.35 | 5.64 | 4.88 | 1.77 | 2.89 | 3.40 | 30.50 |
| 1988 | 1.53 | 1.10 | 1.52 | 3.95 | 0.63 | 0.20 | 2.56 | 5.08 | 5.97 | 3.35 | 4.26 | 1.26 | 31.41 |
| 1989 | 1.15 | 0.67 | 2.13 | 1.44 | 6.57 | 3.61 | 0.93 | 4.90 | 3.49 | 1.29 | 3.65 | 0.86 | 30.69 |
| 1990 | 1.55 | 2.65 | 1.40 | 2.36 | 3.43 | 2.50 | 3.61 | 2.40 | 4.00 | 5.58 | 5.40 | 2.79 | 37.67 |
| 1991 | 1.28 | 0.79 | 3.76 | 4.41 | 1.75 | 2.60 | 2.41 | 3.83 | 1.05 | 3.80 | 3.02 | 2.13 | 30.83 |
| 1992 | 1.38 | 1.36 | 2.68 | 4.64 | 2.09 | 2.07 | 6.43 | 2.79 | 3.21 | 2.18 | 3.88 | 2.16 | 34.87 |
| 1993 | 3.22 | 1.17 | 1.74 | 4.86 | 1.37 | 6.50 | 2.94 | 3.80 | 4.80 | 2.99 | 1.39 | 0.70 | 35.48 |
| 1994 | 1.87 | 1.10 | 1.95 | 3.60 | 1.12 | 5.54 | 3.90 | 5.30 | 2.99 | 2.63 | 3.87 | 1.55 | 35.42 |
| 1995 | 2.34 | 1.18 | 2.01 | 2.85 | 2.83 | 0.95 | 2.04 | 2.87 | 1.06 | 2.55 | 3.37 | 1.05 | 25.10 |
| 1996 | 1.26 | 0.78 | 1.05 | 3.58 | 3.39 | 8.49 | 1.82 | 3.71 | 2.41 | 2.73 | 1.59 | 2.58 | 33.39 |
| 1997 | 1.24 | 3.83 | 2.07 | 1.69 | 3.19 | 1.74 | 2.22 | 3.92 | 3.10 | 1.66 | 1.39 | 0.89 | 26.94 |
| 1998 | 3.34 | 2.15 | 3.97 | 2.62 | 1.58 | 3.45 | 2.15 | 2.62 | 1.55 | 2.40 | 1.63 | 1.53 | 28.99 |
| 1999 | 2.63 | 1.06 | 0.94 | 5.79 | 1.66 | 4.53 | 3.64 | 2.41 | 2.04 | 1.22 | 1.10 | 1.84 | 28.86 |
| 2000 | 1.07 | 1.00 | 1.21 | 3.30 | 6.98 | 1.96 | 2.63 | 2.81 | 6.16 | 1.73 | 2.26 | 1.06 | 32.17 |
| 2001 | 0.65 | 2.79 | 0.17 | 2.68 | 6.07 | 3.64 | 1.25 | 2.43 | 3.23 | 5.69 | 2.25 | 1.13 | 31.98 |
| 2002 | 0.98 | 1.37 | 1.67 | 2.29 | 3.56 | 1.67 | 4.37 | 1.94 | 0.65 | 1.21 | 1.43 | 0.79 | 21.93 |
| 2003 | 0.24 | 0.32 | 1.57 | 2.82 | 3.97 | 1.88 | 1.81 | 1.27 | 2.06 | 1.84 | 5.62 | 1.43 | 24.83 |
| 2004 | 0.91 | 0.55 | 3.35 | 0.68 | 10.44 | 3.08 | 3.80 | 3.19 | 1.02 | 1.92 | 4.02 | 1.84 | 34.80 |
| 2005 | 4.39 | 2.02 | 1.35 | 1.05 | 1.72 | 5.49 | 5.76 | 0.74 | 2.78 | 0.57 | 4.53 | 1.91 | 32.31 |
| 2006 | 4.14 | 1.72 | 2.64 | 1.82 | 4.74 | 1.60 | 4.05 | 3.41 | 3.07 | 2.95 | 3.75 | 3.07 | 36.96 |
| 2007 | 2.13 | 0.47 | 2.66 | 3.37 | 3.49 | 3.09 | 0.71 | 6.42 | 1.86 | 3.36 | 1.35 | 2.43 | 31.34 |
| 2008 | 2.81 | 2.67 | 2.38 | 2.16 | 1.29 | 4.89 | 3.15 | 1.38 | 8.22 | 2.12 | 1.69 | 3.80 | 36.56 |
| 2009 | 1.05 | 2.32 | 3.08 | 6.49 | 4.08 | 4.45 | 2.92 | 6.44 | 0.69 | 4.08 | 0.99 | 1.52 | 38.11 |
| 2010 | 0.86 | 1.35 | 0.45 |
This page will be updated approximately once per year with the latest data. If you need more recent data than what is available on this page, data for the current and previous year is available at our NOWData page.