1980 08 23.26  18.02  20.64 
1980 09 25.89  19.62  22.75 
1980 10 27.98  21.59  24.78 
1980 11 99.99  22.61 -99.99 
1980 12 29.50  23.12  26.31 
1981 01 28.30  23.43  25.86 
1981 02 30.21  24.76  27.48 
1981 03 28.69  23.31  26.00 
1981 04 27.75 -99.99 -99.99 
1981 05 24.49  19.75  22.12 
1981 06 22.28  17.69  19.98 
1981 07 22.30  17.62  19.95 
1981 08 22.66  17.56  20.11 
1981 09 25.21  19.39  22.30 
1981 10 26.25  20.34  23.29 
1981 11 27.86  21.98  24.92 
1981 12 30.52  24.25  27.38 
1982 02 31.03  25.14  28.08 
1982 03 30.63  24.74  27.68 
1982 04 27.59  22.67  25.13 
1982 05 25.31  20.27  22.79 
1982 06 20.91  16.66  18.78 
1982 09 24.39  18.92  21.65 
1982 10 25.78  19.62  22.70 
1982 11 27.80  21.70  24.75 
1983 01 29.78  24.41  27.09 
1983 02 30.98  24.90  27.93 
1983 03 29.09  24.11  26.60 
1983 04 27.55  22.88  25.21 
1983 05 24.86  21.60  23.23 
1983 06 21.88  18.20  20.04 
1983 07 20.89  16.87  18.88 
1983 08 22.17  17.43  19.79 
1983 09 25.60  19.91  22.75 
1983 10 27.51  21.54  24.52 
1983 11 28.38  22.70  25.54 
1983 12 28.68  23.05  25.86 
1984 01 30.08  24.47  27.27 
1984 02 29.62 -99.99 -99.99 
1984 03 29.25 -99.99 -99.99 
1984 04 26.25  21.69  23.97 
1984 05 24.33  20.18  22.25 
1984 06 22.19  18.02  20.10 
1984 07 21.22  16.59  18.90 
1984 08 22.56  17.73  20.14 
1984 09 24.34  18.87  21.61 
1984 10 25.73  19.76  22.74 
1984 11 28.33  22.06  25.19 
1984 12 30.23  23.95  27.09 
1985 01 31.10  25.03  28.06 
1985 02 29.88  24.46  27.16 
1985 03 28.80  23.34  26.07 
1985 04 26.44  22.43  24.43 
1985 05 24.79  20.31  22.55 
1985 06 21.50  17.23  19.36 
1985 07 20.74  16.82  18.77 
1985 08 22.92  17.53  20.22 
1985 09 23.90  18.43  21.16 
1985 10 26.15  20.34  23.24 
1985 11 27.79  22.15  24.97 
1986 01 30.05  25.29  27.67 
1986 02 29.83  24.89  27.36 
1986 03 28.81  23.65  26.23 
1986 04 27.22  22.67  24.94 
1986 06 21.90  17.50  19.70 
1986 07 22.36  17.86  20.11 
1986 10 27.75  21.62  24.68 
1990 07 22.53  17.03  19.78 
1990 08 22.07  16.83  19.45 
1990 09 24.41  18.36  21.38 
1990 10 99.99  21.03 -99.99 
1990 11 99.99  22.75 -99.99 
1990 12 32.15  25.23  28.69 
1991 01 30.79  25.00  27.89 
1991 02 31.24  25.56  28.40 
1991 03 31.23  24.47  27.84 
1991 04 99.99  22.44 -99.99 
1991 05 99.99  20.68 -99.99 
1991 06 24.31  19.17  21.74 
1991 07 21.69  16.79  19.24 
1992 04 27.36 -99.99 -99.99 
1992 06 21.90 -99.99 -99.99 
1992 07 21.84 -99.99 -99.99 
1992 08 22.97 -99.99 -99.99 
1993 01 30.52 -99.99 -99.99 
1993 06 23.39 -99.99 -99.99 
1993 08 24.05 -99.99 -99.99 
1993 09 25.26 -99.99 -99.99 
1993 12 30.46 -99.99 -99.99 
1994 04 26.03 -99.99 -99.99 
1994 05 24.72 -99.99 -99.99 
1995 08 26.15 -99.99 -99.99 
1995 09 27.26 -99.99 -99.99 
1996 03 31.45 -99.99 -99.99 
1996 04 31.47 -99.99 -99.99 
1996 05 27.59  20.64  24.11 
