| Monthly Liquid | ||||||||||||||
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Total | ||
| 2008 | 1.74 | 4.93 | 4.70 | 3.70 | 2.59 | 2.08 | 3.48 | 2.53 | 6.81 | 1.95 | 1.63 | 36.14 | 2008 | |
| 2007 | 3.96 | 2.41 | 5.53 | 7.39 | 2.61 | 3.06 | 2.45 | 1.92 | 1.46 | 1.71 | 2.95 | 4.57 | 40.02 | 2007 |
| 2006 | 5.71 | 2.04 | .53 | 3.09 | 6.99 | 9.32 | 3.19 | 4.01 | 3.23 | 5.38 | 5.96 | 2.43 | 51.88 | 2006 |
| 2005 | 3.60 | 2.21 | 5.43 | 4.86 | 3.69 | 1.51 | .88 | 3.54 | 2.97 | 10.20 | 7.15 | 2.99 | 49.03 | 2005 |
| 2004 | 1.56 | 2.84 | 3.04 | 6.30 | 2.25 | 2.70 | 3.21 | 6.62 | 7.01 | 2.98 | 4.47 | 5.18 | 48.16 | 2004 |
| 2003 | 2.19 | 4.62 | 6.10 | 6.49 | 2.73 | 5.69 | 3.67 | 5.46 | 3.17 | 4.92 | 3.21 | 3.82 | 52.07 | 2003 |
| 2002 | 3.78 | 1.80 | 5.46 | 4.51 | 6.95 | 3.20 | 1.53 | 1.10 | 7.08 | 5.28 | 5.96 | 6.27 | 52.92 | 2002 |
| 2001 | 2.95 | 2.72 | 12.48 | 2.62 | 3.62 | 5.64 | 4.67 | 3.56 | 1.97 | 2.27 | .89 | 2.58 | 45.97 | 2001 |
| 2000 | 3.31 | 2.72 | 7.46 | 5.69 | 3.31 | 4.26 | 4.70 | 3.90 | 5.48 | .78 | 4.21 | 5.47 | 51.29 | 2000 |
| 1999 | 5.30 | 6.19 | 4.06 | 1.73 | 3.30 | .14 | 1.53 | 3.49 | 5.14 | 7.31 | 2.96 | 2.94 | 44.09 | 1999 |
| 1998 | 6.51 | 7.40 | 5.34 | 5.70 | 4.58 | 10.87 | 1.16 | 3.75 | 3.19 | 3.56 | 2.29 | 1.40 | 55.75 | 1998 |
| 1997 | 3.83 | 2.45 | 7.68 | 3.87 | 3.19 | 1.86 | 2.74 | 9.95 | 1.05 | 2.19 | 5.96 | 3.66 | 48.43 | 1997 |
| 1996 | 6.11 | 3.26 | 3.30 | 6.07 | 3.10 | 1.85 | 4.01 | 2.69 | 7.97 | 7.13 | 1.59 | 7.01 | 54.09 | 1996 |
| 1995 | 3.66 | 3.20 | 2.09 | 3.51 | 4.30 | 3.12 | 1.19 | 1.63 | 4.06 | 6.10 | 6.56 | 3.22 | 42.64 | 1995 |
| 1994 | 5.13 | 3.48 | 8.70 | 2.04 | 3.97 | 2.95 | 1.84 | 4.50 | 3.57 | .71 | 6.18 | 5.01 | 48.08 | 1994 |
| 1993 | 2.35 | 4.34 | 6.70 | 5.22 | .98 | 1.43 | 3.40 | .33 | 2.67 | 3.98 | 2.94 | 6.43 | 40.77 | 1993 |
| 1992 | 4.38 | 2.48 | 3.74 | 2.33 | 1.26 | 2.85 | 3.13 | 8.38 | 4.41 | 1.57 | 4.68 | 7.78 | 46.99 | 1992 |
| 1991 | 3.46 | 2.29 | 6.19 | 4.93 | 2.88 | .71 | 1.58 | 7.73 | 7.71 | 3.34 | 4.69 | 3.18 | 48.69 | 1991 |
| 1990 | 5.14 | 3.67 | 2.10 | 5.30 | 5.17 | 1.61 | 6.98 | 1.33 | 3.45 | 4.34 | 2.03 | 6.07 | 47.19 | 1990 |
| 1989 | 1.84 | 3.08 | 4.27 | 5.41 | 5.61 | 5.07 | 5.87 | 4.60 | 5.40 | 7.31 | 5.34 | 2.21 | 56.01 | 1989 |
| 1988 | 3.06 | 6.53 | 4.39 | 2.88 | 2.35 | 3.02 | 6.81 | .94 | 2.26 | 2.18 | 8.24 | 1.91 | 44.57 | 1988 |
| 1987 | 4.75 | .87 | 5.05 | 6.11 | 2.14 | 1.25 | 1.06 | 2.70 | 7.34 | 3.66 | 3.59 | 3.53 | 42.05 | 1987 |
| 1986 | 5.68 | 3.37 | 3.10 | 1.85 | 1.80 | 4.33 | 6.14 | 4.24 | 1.16 | 2.76 | 7.22 | 7.24 | 48.89 | 1986 |
| 1985 | 1.19 | 1.60 | 3.55 | 1.19 | 5.75 | 4.14 | 2.48 | 11.81 | 1.77 | 1.65 | 7.41 | .91 | 43.45 | 1985 |
| 1984 | 2.29 | 6.39 | 5.15 | 4.91 | 8.99 | 6.60 | 5.90 | .65 | 2.22 | 4.71 | 1.35 | 3.70 | 52.86 | 1984 |
| 1983 | 4.74 | 5.38 | 9.15 | 11.94 | 4.54 | 3.37 | 1.50 | 3.58 | 1.50 | 4.49 | 10.08 | 5.22 | 65.49 | 1983 |
| 1982 | 5.55 | 3.07 | 3.14 | 4.42 | 2.56 | 9.44 | 1.96 | 2.71 | 3.98 | 2.49 | 4.30 | 2.61 | 46.23 | 1982 |
| 1981 | 1.00 | 4.40 | 1.05 | 4.60 | 1.74 | 4.35 | 2.01 | 1.37 | 2.43 | 2.94 | 3.38 | 8.02 | 37.29 | 1981 |
| 1980 | 1.44 | 1.21 | 9.51 | 6.82 | 1.71 | 2.96 | 1.77 | 1.70 | .68 | 4.41 | 3.79 | 2.19 | 38.19 | 1980 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Total | ||
| 1979 | 12.04 | 5.36 | 2.14 | 5.05 | 6.43 | 1.26 | 2.14 | 5.79 | 3.89 | 4.38 | 3.94 | 2.36 | 54.78 | 1979 |
| 1978 | 7.18 | 2.72 | 3.26 | 1.98 | 6.59 | 1.35 | 3.90 | 2.70 | 2.48 | 3.50 | 3.59 | 4.99 | 44.24 | 1978 |
| 1977 | 3.59 | 2.65 | 5.06 | 3.82 | 2.66 | 5.76 | 1.86 | 5.37 | 4.10 | 6.46 | 2.49 | 7.48 | 51.30 | 1977 |
| 1976 | 5.42 | 2.46 | 3.68 | 1.80 | 2.18 | 1.02 | 2.31 | 6.74 | 1.93 | 4.39 | .89 | 3.19 | 36.01 | 1976 |
| 1975 | 6.85 | 3.47 | 3.01 | 3.52 | 2.44 | 5.26 | 3.43 | 2.59 | 5.32 | 4.72 | 7.29 | 4.06 | 51.96 | 1975 |
| 1974 | 4.66 | 2.23 | 3.76 | 3.14 | 3.32 | 1.97 | 1.47 | 1.97 | 4.78 | 2.50 | 1.59 | 3.32 | 34.71 | 1974 |
| 1973 | 3.62 | 3.66 | 3.84 | 7.11 | 3.57 | 2.85 | 6.47 | 2.90 | 3.79 | 3.00 | 2.74 | 8.00 | 51.55 | 1973 |
| 1972 | 2.64 | 5.49 | 6.03 | 4.32 | 6.86 | 7.03 | 1.29 | 2.57 | 6.37 | 4.12 | 7.83 | 7.63 | 62.18 | 1972 |
| 1971 | 2.30 | 5.86 | 3.35 | 2.14 | 4.75 | .67 | 1.51 | 2.74 | 1.60 | 3.17 | 5.84 | 2.58 | 36.51 | 1971 |
| 1970 | .98 | 5.60 | 4.89 | 4.04 | 2.80 | 4.11 | 1.48 | 4.32 | 4.38 | 3.58 | 5.06 | 3.45 | 44.69 | 1970 |
| 1969 | 2.05 | 5.77 | 3.24 | 3.80 | 2.09 | 1.38 | 1.79 | 4.22 | 4.95 | 2.89 | 8.03 | 9.26 | 49.47 | 1969 |
| 1968 | 3.52 | 1.20 | 8.23 | 1.27 | 3.62 | 4.69 | 1.39 | .44 | .88 | 2.49 | 7.18 | 5.89 | 40.80 | 1968 |
| 1967 | 1.72 | 2.83 | 5.46 | 5.17 | 8.33 | 2.50 | 5.37 | 3.13 | 3.62 | 1.51 | 3.37 | 8.03 | 51.04 | 1967 |
| 1966 | 3.95 | 2.88 | 2.27 | 1.45 | 4.98 | 1.92 | 1.55 | 1.16 | 4.52 | 2.77 | 4.16 | 2.60 | 34.21 | 1966 |
| 1965 | 4.04 | 2.54 | 1.93 | 3.16 | 1.82 | 1.30 | 1.00 | 3.86 | 2.35 | 2.36 | 1.88 | 1.42 | 27.66 | 1965 |
| 1964 | 3.68 | 3.40 | 2.65 | 7.55 | .97 | 1.19 | 3.22 | 1.28 | 3.43 | 2.92 | 2.38 | 5.91 | 38.58 | 1964 |
| 1963 | 3.69 | 3.46 | 4.02 | 1.38 | 4.21 | 1.44 | 3.71 | 3.87 | 4.45 | 1.73 | 6.26 | 2.12 | 40.34 | 1963 |
| 1962 | 3.98 | 5.37 | 1.49 | 3.27 | 2.09 | 4.74 | 1.60 | 3.36 | 3.63 | 9.33 | 4.51 | 3.48 | 46.85 | 1962 |
| 1961 | 2.74 | 4.45 | 3.70 | 7.11 | 4.95 | 1.97 | 1.21 | 3.98 | 10.67 | 2.89 | 3.88 | 3.69 | 51.24 | 1961 |
| 1960 | 3.30 | 6.01 | 4.03 | 3.66 | 3.57 | 2.22 | 4.36 | .64 | 10.61 | 2.39 | 3.17 | 5.76 | 49.72 | 1960 |
| 1959 | 2.06 | 3.44 | 7.08 | 3.89 | 2.16 | 6.99 | 5.05 | 3.68 | .31 | 3.62 | 4.73 | 3.82 | 46.83 | 1959 |
| 1958 | 7.58 | 3.96 | 5.38 | 8.59 | 4.70 | 2.67 | 3.42 | 5.86 | 3.92 | 2.64 | 2.90 | 1.86 | 53.48 | 1958 |
| 1957 | 2.17 | 1.68 | 3.29 | 4.46 | .93 | .39 | 1.41 | 2.21 | 1.10 | 2.52 | 3.99 | 5.86 | 30.01 | 1957 |
| 1956 | 4.82 | 4.60 | 5.51 | 3.08 | 1.43 | 1.57 | 4.92 | .91 | 3.10 | 3.74 | 3.62 | 5.27 | 42.57 | 1956 |
| 1955 | .78 | 4.97 | 5.25 | 3.61 | 2.37 | 3.72 | 3.06 | 10.22 | 3.27 | 7.00 | 5.60 | .59 | 50.44 | 1955 |
| 1954 | 2.84 | 2.68 | 3.53 | 4.91 | 5.92 | 1.32 | 2.56 | 8.30 | 6.04 | 2.79 | 4.92 | 5.73 | 51.54 | 1954 |
| 1953 | 6.43 | 4.54 | 7.82 | 5.99 | 3.25 | .55 | 4.43 | 3.99 | 2.99 | 4.71 | 6.59 | 5.42 | 56.71 | 1953 |
| 1952 | 5.09 | 3.77 | 4.88 | 3.32 | 4.18 | 2.13 | .36 | 7.81 | 1.60 | .99 | 1.90 | 3.55 | 39.58 | 1952 |
| 1951 | 4.15 | 3.40 | 4.24 | 2.57 | 3.76 | 2.07 | 1.97 | 2.70 | 2.05 | 2.74 | 7.25 | 4.78 | 41.68 | 1951 |
| 1950 | 3.34 | 4.28 | 3.65 | 2.49 | 2.56 | 2.04 | 1.16 | 3.45 | 1.19 | 1.58 | 6.00 | 3.69 | 35.43 | 1950 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Total | ||
| 1949 | 4.90 | 4.12 | 2.58 | 4.57 | 2.80 | .05 | 1.71 | 3.36 | 4.05 | 1.77 | 3.26 | 2.22 | 35.39 | 1949 |
| 1948 | 5.01 | 2.60 | 4.40 | 3.92 | 9.19 | 2.42 | 2.18 | .98 | .96 | 4.39 | 4.54 | 2.36 | 42.95 | 1948 |
| 1947 | 3.02 | .66 | 3.36 | 5.43 | 3.65 | 3.20 | 4.61 | 2.26 | 2.77 | 3.23 | 5.33 | 3.51 | 41.03 | 1947 |
| 1946 | 4.12 | 2.67 | 1.79 | 2.53 | 4.89 | 2.77 | 1.78 | 11.77 | 1.85 | .36 | .84 | 3.53 | 38.90 | 1946 |
| 1945 | 3.08 | 3.59 | 2.35 | 2.41 | 4.66 | 2.27 | 1.28 | 3.46 | 1.28 | 2.58 | 7.86 | 7.31 | 42.13 | 1945 |
| 1944 | 3.01 | 1.69 | 5.10 | 3.76 | .86 | 2.23 | .57 | 1.65 | 6.53 | 2.33 | 9.59 | 2.97 | 40.29 | 1944 |
| 1943 | 3.20 | 1.86 | 2.68 | 3.32 | 3.16 | 1.27 | 2.66 | 2.59 | 1.24 | 4.02 | 2.85 | 1.85 | 30.70 | 1943 |
| 1942 | 3.64 | 2.97 | 6.22 | .78 | 1.85 | 2.52 | 4.69 | 7.42 | 2.22 | 3.72 | 5.62 | 5.78 | 47.43 | 1942 |
| 1941 | 3.59 | 2.34 | 3.54 | 1.72 | 3.10 | 4.44 | 5.68 | 2.45 | .44 | 1.96 | 2.96 | 2.84 | 35.06 | 1941 |
| 1940 | 2.51 | 3.33 | 3.70 | 5.35 | 5.06 | 2.28 | 3.24 | .99 | 2.90 | 2.24 | 6.81 | 2.20 | 40.61 | 1940 |
| 1939 | 3.13 | 4.98 | 5.12 | 4.52 | .57 | 3.33 | 1.01 | 6.26 | 2.39 | 4.41 | .91 | 3.12 | 39.75 | 1939 |
| 1938 | 4.37 | 2.41 | 2.44 | 2.84 | 4.53 | 7.30 | 6.62 | 3.33 | 6.18 | 3.17 | 3.60 | 3.50 | 50.29 | 1938 |
| 1937 | 4.70 | 1.84 | 3.86 | 5.29 | 3.08 | 3.65 | 1.16 | 4.29 | 3.26 | 4.11 | 5.42 | 3.22 | 43.88 | 1937 |
| 1936 | 6.86 | 3.77 | 6.78 | 3.79 | 1.73 | 3.05 | 2.34 | 3.32 | 5.37 | 2.49 | 1.41 | 9.94 | 50.85 | 1936 |
| 1935 | 6.05 | 2.78 | 1.88 | 3.40 | 1.52 | 4.84 | 3.14 | 1.25 | 3.66 | .80 | 4.86 | 1.16 | 35.34 | 1935 |
| 1934 | 3.84 | 3.55 | 3.94 | 4.11 | 3.85 | 3.47 | .82 | 2.35 | 4.16 | 3.06 | 3.88 | 3.26 | 40.29 | 1934 |
| 1933 | 2.28 | 3.98 | 5.92 | 5.43 | 4.11 | 2.99 | 2.24 | 3.13 | 6.99 | 2.85 | 2.24 | 3.50 | 45.66 | 1933 |
| 1932 | 5.12 | 2.03 | 4.88 | 1.98 | 2.53 | 2.45 | 3.03 | 4.93 | 9.13 | 5.69 | 4.93 | 2.01 | 48.71 | 1932 |
| 1931 | 3.88 | 2.27 | 4.32 | 2.70 | 4.07 | 5.08 | 3.11 | 5.04 | 1.87 | 2.77 | .94 | 3.20 | 39.25 | 1931 |
| 1930 | 3.09 | 3.00 | 3.03 | 1.31 | 3.12 | 2.81 | 3.89 | 2.39 | 1.55 | 3.63 | 3.57 | 3.51 | 34.90 | 1930 |
| 1929 | 4.53 | 3.24 | 4.13 | 6.36 | 3.51 | <|||||||||