1980 01 99.99 -99.99   5.70 
1980 04 99.99 -99.99  19.60 
1980 06 99.99 -99.99  23.70 
1980 07 99.99 -99.99  17.20 
1980 08 99.99 -99.99  28.40 
1980 11 99.99 -99.99  10.00 
1980 12 99.99 -99.99   4.80 
1981 01 99.99 -99.99   4.90 
1981 03 99.99 -99.99  13.80 
1981 05 99.99 -99.99  18.79 
1981 08 99.99 -99.99  25.50 
1981 09 99.99 -99.99  22.90 
1981 11 99.99 -99.99  12.20 
1981 12 99.99 -99.99   9.20 
1982 01 99.99 -99.99   7.10 
1982 02 99.99 -99.99   7.70 
1982 03 99.99 -99.99  11.30 
1982 04 99.99 -99.99  11.60 
1982 05 99.99 -99.99  17.79 
1982 06 99.99 -99.99  26.40 
1982 07 99.99 -99.99  29.90 
1982 08 99.99 -99.99  27.10 
1982 09 99.99 -99.99  22.70 
1982 10 99.99 -99.99  14.60 
1982 11 99.99 -99.99   9.39 
1982 12 99.99 -99.99   4.80 
1983 01 99.99 -99.99   5.90 
1983 02 99.99 -99.99   8.50 
1983 03 99.99 -99.99  12.80 
1983 04 99.99 -99.99  14.60 
1983 05 99.99 -99.99  18.40 
1983 06 99.99 -99.99  24.80 
1983 07 99.99 -99.99  27.80 
1983 08 99.99 -99.99  27.20 
1983 09 99.99 -99.99  23.80 
1983 10 99.99 -99.99  18.10 
1983 12 99.99 -99.99   7.40 
1984 01 99.99 -99.99   6.00 
1984 02 99.99 -99.99   6.80 
1984 03 99.99 -99.99   9.39 
1984 04 99.99 -99.99  16.50 
1984 06 99.99 -99.99  24.30 
1984 07 99.99 -99.99  29.10 
1984 08 99.99 -99.99  26.80 
1984 09 99.99 -99.99  23.20 
1984 10 99.99 -99.99  14.80 
1985 01 99.99 -99.99   5.00 
1985 02 99.99 -99.99  11.70 
1985 03 99.99 -99.99   8.89 
1985 04 99.99 -99.99  15.00 
1985 05 99.99 -99.99  16.50 
1985 06 99.99 -99.99  20.40 
1985 07 99.99 -99.99  29.30 
1985 08 99.99 -99.99  27.80 
1985 09 99.99 -99.99  23.10 
1985 10 99.99 -99.99  17.90 
1985 11 99.99 -99.99  12.30 
1986 02 99.99 -99.99   6.90 
1986 03 99.99 -99.99   9.00 
1986 04 99.99 -99.99  11.70 
1986 05 99.99 -99.99  22.10 
1986 06 99.99 -99.99  23.20 
1986 07 99.99 -99.99  27.50 
1986 08 99.99 -99.99  28.10 
1986 09 99.99 -99.99  23.00 
1986 10 99.99 -99.99  15.50 
1986 11 99.99 -99.99   9.30 
1987 01 99.99 -99.99   6.50 
1987 02 99.99 -99.99   8.00 
1987 03 99.99 -99.99  12.40 
1987 05 99.99 -99.99  18.70 
1987 06 99.99 -99.99  24.90 
1987 07 99.99 -99.99  26.50 
1987 09 99.99 -99.99  24.50 
1987 10 99.99 -99.99  18.10 
1987 11 99.99 -99.99  10.30 
1987 12 99.99 -99.99   9.60 
1988 01 99.99 -99.99   8.20 
1988 02 99.99 -99.99   8.30 
1988 03 99.99 -99.99  11.40 
1988 04 99.99 -99.99  15.20 
1988 05 99.99 -99.99  18.70 
1988 06 99.99 -99.99  22.20 
1988 07 99.99 -99.99  28.80 
1988 08 99.99 -99.99  29.10 
1988 09 99.99 -99.99  22.70 
1988 10 99.99 -99.99  17.29 
1988 11 99.99 -99.99  11.70 
1988 12 99.99 -99.99   5.20 
1989 01 99.99 -99.99   4.69 
1989 02 99.99 -99.99   7.70 
1989 03 99.99 -99.99  11.50 
1989 04 99.99 -99.99  12.20 
1989 05 99.99 -99.99  18.70 
1989 06 99.99 -99.99  22.60 
1989 07 99.99 -99.99  28.20 
1989 09 99.99 -99.99  23.10 
1989 11 99.99 -99.99  12.80 
1990 03 99.99 -99.99  13.00 
1990 04 99.99 -99.99  12.70 
1990 05 99.99 -99.99  18.29 
1990 06 99.99 -99.99  18.29 
1990 09 99.99 -99.99  24.80 
1990 10 99.99 -99.99  17.70 
1990 11 99.99 -99.99  11.10 
1990 12 99.99 -99.99   6.20 
1991 02 99.99 -99.99   6.00 
1991 03 99.99 -99.99   9.39 
1991 07 99.99 -99.99  28.20 
1991 08 99.99 -99.99  32.80 
1991 09 99.99 -99.99  22.80 
1991 10 99.99 -99.99  13.90 
1991 11 99.99 -99.99  10.10 
