1980 04 -5.50  -8.89  -7.20 
1980 05 -5.80 -10.30  -8.05 
1980 06 14.30 -25.00 -19.65 
1980 07 -7.90 -13.70 -10.80 
1980 08 10.40 -17.90 -14.15 
1980 09 12.80 -21.20 -17.00 
1980 10 -9.00 -14.80 -11.90 
1980 11 -7.10 -11.40  -9.25 
1980 12 -2.40  -5.90  -4.15 
1981 01 -1.90  -5.60  -3.75 
1981 02 -4.69  -9.50  -7.10 
1981 03 -5.90  -9.50  -7.70 
1981 04 10.30 -18.00 -14.15 
1981 05 12.80 -19.40 -16.10 
1981 06 14.20 -21.30 -17.75 
1981 07 14.30 -22.20 -18.25 
1981 08 21.30 -28.70 -25.00 
1981 09 16.10 -23.10 -19.60 
1981 10 10.20 -15.50 -12.85 
1981 11 -7.20 -11.90  -9.54 
1981 12 -1.80  -4.90  -3.35 
1982 01  1.30  -2.40   -.55 
1982 02 -3.20  -7.50  -5.35 
1982 03 -9.30 -13.50 -11.40 
1982 04 18.70 -24.90 -21.80 
1982 05 15.00 -21.00 -18.00 
1982 06 13.00 -20.10 -16.54 
1982 07 14.10 -22.60 -18.35 
1982 08 13.80 -21.70 -17.75 
1982 09 14.40 -22.10 -18.25 
1982 10 12.20 -19.29 -15.75 
1982 11 -5.40  -9.50  -7.45 
1982 12  -.10  -4.00  -2.05 
1983 01 -1.80  -6.10  -3.94 
1983 02 -4.80  -9.89  -7.35 
1983 03 -6.50 -10.00  -8.25 
1983 04 -7.70 -12.00  -9.85 
1983 05 -7.60 -12.30  -9.95 
1983 06 15.70 -23.60 -19.65 
1983 07 16.20 -25.50 -20.85 
1983 08 19.29 -27.20 -23.25 
1983 09 12.60 -20.60 -16.60 
1983 10 12.60 -18.40 -15.50 
1983 11 -7.40 -11.50  -9.45 
1983 12 -1.70  -5.40  -3.55 
1984 01  -.60  -5.20  -2.90 
1984 02 -3.50  -6.90  -5.20 
1984 03 -4.60  -9.80  -7.20 
1984 04 -9.60 -15.40 -12.50 
1984 05 11.50 -17.90 -14.70 
1984 06 10.10 -16.79 -13.45 
1984 07 23.50 -32.59 -28.05 
1984 08 21.00 -31.80 -26.40 
1984 09 18.79 -28.30 -23.55 
1984 10 10.30 -15.90 -13.10 
1984 11 -5.60 -10.00  -7.80 
1984 12   .30  -3.60  -1.65 
1985 01   . 0  -4.10  -2.05 
1985 02 -5.00  -9.89  -7.45 
1985 03 -7.70 -12.50 -10.10 
1985 04 -9.30 -16.10 -12.70 
1985 05 10.10 -15.40 -12.75 
1985 06 19.20 -27.50 -23.35 
1985 07 21.70 -33.90 -27.80 
1985 08 17.79 -26.80 -22.30 
1985 09 16.60 -24.00 -20.29 
1985 10 13.00 -19.60 -16.29 
1985 11 -5.60 -10.00  -7.80 
1985 12 -2.30  -6.40  -4.35 
1986 01 -1.20  -5.00  -3.10 
1986 02 -2.80  -7.20  -5.00 
1986 03 -7.90 -12.80 -10.35 
1986 04 11.70 -18.40 -15.04 
1986 05 10.60 -14.50 -12.55 
1986 06 14.60 -22.30 -18.45 
1986 07 17.10 -27.50 -22.30 
1986 08 19.10 -29.40 -24.25 
1986 09 21.60 -30.20 -25.90 
1986 10 12.60 -18.79 -15.70 
1986 11 -7.10 -12.00  -9.55 
1986 12 -2.60  -5.90  -4.25 
1987 01   .30  -4.40  -2.05 
1987 02 -3.70  -8.70  -6.20 
1987 03 12.10 -19.50 -15.80 
1987 04 11.60 -16.40 -14.00 
1987 05 10.30 -16.40 -13.35 
1987 06 11.60 -18.70 -15.15 
1987 07 11.80 -19.00 -15.40 
1987 08 13.60 -22.90 -18.25 
1987 09 14.30 -22.20 -18.25 
1987 10 11.80 -17.60 -14.70 
1987 11 -8.30 -13.70 -11.00 
1987 12  -.40  -4.40  -2.40 
1988 01 -1.40  -5.00  -3.20 
1988 02 -3.80  -8.89  -6.35 
1988 03 -8.70 -14.50 -11.60 
1988 04 -6.80 -11.80  -9.30 
1988 05 10.60 -15.60 -13.10 
1988 06 11.00 -18.10 -14.55 
1988 07 11.50 -19.10 -15.30 
1988 08 10.50 -17.70 -14.10 
1988 09 12.80 -19.60 -16.20 
1988 10 10.40 -15.60 -13.00 
1988 11 -5.30  -9.00  -7.15 
1988 12 -1.70  -4.90  -3.30 
1989 01  -.20  -3.40  -1.80 
1989 02 -2.60  -7.10  -4.85 
1989 03 -5.90 -10.90  -8.39 
1989 04 -6.20 -10.70  -8.45 
1989 05 16.79 -25.80 -21.30 
1989 06 15.80 -23.40 -19.60 
1989 07 16.90 -26.10 -21.50 
1989 08 17.70 -26.20 -21.95 
1989 09 18.60 -26.40 -22.50 
1989 10 10.60 -16.90 -13.75 
1989 11 -5.80 -10.30  -8.05 
1989 12 -1.10  -4.80  -2.95 
1990 01   .10  -3.30  -1.60 
1990 02   .10  -3.80  -1.85 
