1971 03 -8.30 -13.90 -11.10 
1971 04 12.00 -17.20 -14.60 
1971 05 13.20 -20.20 -16.70 
1971 06 12.30 -20.29 -16.29 
1971 07 17.00 -23.60 -20.29 
1971 08 15.60 -23.50 -19.54 
1971 09 17.90 -23.50 -20.70 
1971 10 13.20 -19.00 -16.10 
1971 11 -9.89 -15.10 -12.50 
1971 12 -3.20  -7.20  -5.20 
1972 01 -1.00  -4.00  -2.50 
1972 02 -3.70  -8.50  -6.10 
1972 03 -8.60 -14.00 -11.30 
1972 04 10.90 -15.80 -13.35 
1972 05 15.60 -22.50 -19.04 
1972 06 14.00 -22.20 -18.10 
1972 07 14.60 -22.40 -18.50 
1972 08 17.20 -25.70 -21.45 
1972 09 16.50 -23.70 -20.10 
1972 10 16.20 -22.70 -19.45 
1972 11 -9.20 -15.20 -12.20 
1972 12 -3.30  -6.80  -5.05 
1973 01 -1.50  -5.70  -3.60 
1973 02 -6.00 -11.40  -8.70 
1973 03 -8.80 -15.60 -12.20 
1973 04 12.10 -18.70 -15.40 
1973 05 14.00 -21.30 -17.65 
1973 06 15.40 -23.10 -19.25 
1973 07 15.10 -23.70 -19.40 
1973 08 17.79 -24.80 -21.30 
1973 09 17.40 -25.00 -21.20 
1973 10 15.40 -22.40 -18.90 
1973 11 -6.60 -11.90  -9.25 
1973 12 -2.70  -8.70  -5.70 
1974 01  -.80  -6.50  -3.65 
1974 02 -5.20 -10.90  -8.04 
1974 03 -8.39 -14.50 -11.45 
1974 04 14.40 -20.29 -17.34 
1974 05 15.50 -21.60 -18.54 
1974 06 12.50 -19.00 -15.75 
1974 07 20.10 -27.70 -23.90 
1974 08 16.60 -24.70 -20.65 
1974 09 16.50 -23.80 -20.15 
1974 10 14.60 -21.60 -18.10 
1974 11 -7.10 -12.90 -10.00 
1974 12 -1.60  -6.90  -4.25 
1975 01 -1.00  -6.20  -3.60 
1975 02 -4.90  -9.30  -7.10 
1975 03 -8.10 -14.00 -11.05 
1975 04 13.80 -19.40 -16.60 
1975 05 15.80 -22.60 -19.20 
1975 06 18.20 -25.00 -21.60 
1975 07 14.50 -22.50 -18.50 
1975 08 21.50 -27.40 -24.45 
1975 09 19.29 -25.60 -22.45 
1975 10 16.60 -22.50 -19.54 
1975 11 -8.39 -14.00 -11.20 
1975 12 -3.00  -7.60  -5.30 
1976 01 -1.20  -5.70  -3.44 
1976 02 -3.80  -9.00  -6.40 
1976 03 -9.39 -15.10 -12.25 
1976 04 18.29 -23.20 -20.75 
1976 05 16.79 -23.10 -19.95 
1976 06 19.29 -26.90 -23.09 
1976 07 19.20 -25.90 -22.55 
1976 08 17.20 -24.50 -20.85 
1976 09 19.10 -26.10 -22.60 
1976 10 19.50 -26.00 -22.75 
1976 11 -6.30 -13.60  -9.95 
1976 12  -.20  -5.30  -2.75 
1977 01   .50  -4.80  -2.15 
1977 02 -4.60  -9.00  -6.80 
1977 03 -8.50 -14.40 -11.45 
1977 04 12.60 -18.60 -15.60 
1977 05 16.70 -24.50 -20.60 
1977 06 17.00 -23.70 -20.35 
1977 07 17.50 -27.10 -22.30 
1977 08 15.90 -24.00 -19.95 
1977 09 19.10 -26.50 -22.80 
1977 10 13.60 -20.70 -17.15 
1977 11 -7.90 -13.20 -10.55 
1977 12 -2.30  -7.20  -4.75 
1978 01 -2.60  -7.50  -5.05 
1978 02 -3.50  -8.39  -5.95 
1978 03 -7.20 -11.60  -9.39 
1978 04 11.80 -16.20 -14.00 
1978 05 16.29 -23.50 -19.90 
1978 06 19.00 -26.20 -22.60 
1978 07 13.40 -21.70 -17.54 
1978 08 21.30 -28.20 -24.75 
1978 09 19.20 -25.70 -22.45 
1978 10 15.10 -21.30 -18.20 
1978 11 -7.80 -12.80 -10.30 
1978 12 -3.30  -8.89  -6.10 
1979 01 -2.70  -6.50  -4.60 
1979 02 -4.69  -9.30  -7.00 
1979 03 -7.20 -12.60  -9.89 
1979 04 10.90 -15.80 -13.35 
1979 05 16.60 -21.60 -19.10 
1979 06 17.00 -23.00 -20.00 
1979 07 21.10 -28.10 -24.60 
1979 08 15.80 -25.20 -20.50 
1979 09 16.10 -22.30 -19.20 
1979 10 14.40 -20.00 -17.20 
1979 11 -7.10 -12.50  -9.80 
1979 12  -.70  -5.20  -2.94 
1980 01  -.80  -6.00  -3.40 
1980 02 -3.70  -8.39  -6.05 
1980 03 -5.90 -10.30  -8.10 
1980 04 10.60 -15.40 -13.00 
1980 05 13.10 -18.70 -15.90 
1980 06 17.20 -24.80 -21.00 
1980 07 16.10 -24.90 -20.50 
1980 08 17.40 -23.90 -20.65 
1980 09 14.30 -21.20 -17.75 
1980 10 15.90 -23.60 -19.75 
1980 11 -6.80 -11.50  -9.14 
1980 12 -1.90  -7.40  -4.65 
1981 01 -2.40  -7.60  -5.00 
1981 02 -3.70  -7.90  -5.80 
1981 03 -7.50 -12.50 -10.00 
1981 04 11.20 -16.50 -13.85 
1981 05 14.30 -20.60 -17.45 
1981 06 11.50 -21.20 -16.35 
1981 07 15.10 -23.20 -19.15 
1981 08 14.10 -22.10 -18.10 
1981 09 15.60 -22.10 -18.85 
1981 10 13.50 -18.79 -16.15 
1981 11 -8.80 -14.50 -11.65 
1981 12 -2.70  -8.10  -5.40 
1982 01 -1.20  -6.80  -4.00 
1982 02 -3.50  -8.10  -5.80 
1982 03 -9.70 -15.10 -12.40 
1982 04 15.30 -21.00 -18.15 
1982 05 13.60 -20.50 -17.04 
1982 06 12.80 -20.70 -16.75 
1982 07 18.10 -25.30 -21.70 
1982 08 20.00 -26.70 -23.35 
1982 09 18.00 -24.30 -21.15 
1982 10 14.10 -20.29 -17.20 
1982 11 -7.00 -12.80  -9.89 
1982 12  -.70  -6.10  -3.40 
1983 01 -1.50  -5.20  -3.35 
1983 02 -3.00  -6.40  -4.69 
1983 03 -7.70 -12.40 -10.04 
1983 04 11.80 -17.20 -14.50 
1983 05 12.50 -18.70 -15.60 
1983 06 16.10 -23.60 -19.85 
1983 07 21.20 -27.70 -24.45 
1983 08 20.29 -28.80 -24.55 
1983 09 13.90 -21.20 -17.54 
1983 10 14.10 -21.50 -17.79 
1983 11 -8.50 -14.70 -11.60 
1983 12 -2.30  -6.60  -4.44 
1984 01 -1.40  -5.80  -3.60 
1984 02 -4.50 -10.00  -7.25 
1984 03 -8.00 -13.60 -10.80 
1984 04 14.70 -19.10 -16.90 
1984 05 13.20 -20.00 -16.60 
1984 06 20.80 -26.90 -23.84 
1984 07 21.60 -29.90 -25.75 
1984 08 16.79 -23.50 -20.15 
1984 09 16.00 -22.40 -19.20 
1984 10 12.20 -18.40 -15.29 
1984 11 -8.70 -14.60 -11.65 
1984 12 -2.20  -7.40  -4.80 
1985 01  -.20  -6.30  -3.25 
1985 02 -4.60  -9.10  -6.85 
1985 03 -8.39 -13.70 -11.04 
1985 04 13.10 -17.90 -15.50 
1985 05 16.90 -22.60 -19.75 
1985 06 16.90 -24.30 -20.59 
1985 07 19.60 -26.50 -23.05 
1985 08 18.29 -26.30 -22.30 
1985 09 19.60 -25.70 -22.65 
1985 10 15.30 -22.80 -19.04 
1985 11 -7.90 -14.20 -11.05 
1985 12 -2.90  -8.20  -5.55 
1986 01 -1.60  -6.20  -3.90 
1986 02 -2.90  -9.39  -6.14 
1986 03 -6.50 -10.70  -8.60 
1986 04 11.50 -17.00 -14.25 
1986 05 14.30 -19.79 -17.04 
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1986 07 17.00 -24.00 -20.50 
1986 08 16.40 -25.00 -20.70 
1986 09 18.70 -26.30 -22.50 
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1986 11 -8.00 -14.20 -11.10 
1986 12 -3.00  -9.00  -6.00 
1987 01  -.80  -6.30  -3.55 
1987 02 -4.30  -7.90  -6.10 
1987 03 -6.60 -11.00  -8.80 
1987 04 12.50 -16.60 -14.55 
1987 05 16.70 -22.50 -19.60 
1987 06 12.90 -20.00 -16.45 
1987 07 15.60 -21.70 -18.65 
1987 08 18.10 -25.00 -21.55 
1987 09 17.10 -23.60 -20.35 
1987 10 11.50 -18.79 -15.15 
1987 11 -8.00 -14.20 -11.10 
1987 12 -3.20  -8.50  -5.85 
1988 01 -1.70  -6.60  -4.15 
1988 02 -4.19  -8.70  -6.45 
1988 03 -9.00 -13.70 -11.35 
1988 04 11.30 -17.70 -14.50 
1988 05 17.10 -23.60 -20.35 
1988 06 17.29 -23.90 -20.59 
1988 07 18.79 -25.50 -22.15 
1988 08 18.20 -26.50 -22.35 
1988 09 13.40 -20.70 -17.04 
1988 10 12.60 -18.60 -15.60 
1988 11 -7.70 -13.10 -10.40 
1988 12 -2.20  -7.20  -4.69 
1989 01 -2.00  -7.50  -4.75 
1989 02 -5.30 -10.30  -7.80 
1989 03 -8.60 -13.20 -10.90 
1989 04 12.70 -18.00 -15.35 
1989 05 18.00 -24.30 -21.15 
1989 06 22.20 -28.70 -25.45 
1989 07 16.20 -25.00 -20.60 
1989 08 19.50 -27.50 -23.50 
1989 09 14.40 -21.60 -18.00 
1989 10 13.50 -19.90 -16.70 
1989 11 -8.00 -13.70 -10.85 
1989 12 -2.09  -6.80  -4.44 
1990 01 -1.40  -6.00  -3.70 
1990 02 -4.69  -9.89  -7.30 
1990 03 -8.60 -14.20 -11.40 
1990 04 15.60 -20.60 -18.10 
1990 05 14.20 -19.29 -16.75 
1990 06 18.00 -25.90 -21.95 
1990 07 12.60 -19.29 -15.95 
1990 08 19.20 -27.00 -23.10 
1990 09 19.60 -26.90 -23.25 
1990 10 13.60 -20.90 -17.25 
1990 11 -7.30 -13.30 -10.30 
1990 12 -1.70  -7.20  -4.44 
1991 01 -1.50  -6.50  -4.00 
1991 02 -4.19  -8.89  -6.55 
