1974 12 36.13  23.88  30.00 
1975 01 35.87  24.51  30.18 
1975 02 34.36  23.76  29.06 
1975 03 34.66  23.73  29.19 
1975 04 33.57  20.65  27.11 
1975 05 32.93  15.55  24.24 
1975 06 30.50  13.75  22.12 
1975 07 32.84  15.02  23.93 
1975 08 33.25  15.95  24.60 
1975 09 36.03  22.27  29.15 
1975 10 36.09  22.94  29.51 
1975 11 37.37  24.24  30.80 
1975 12 35.43  24.23  29.83 
1976 01 33.72  23.50  28.61 
1976 02 32.83  24.54  28.68 
1976 03 33.05  22.93  27.99 
1976 04 33.65  19.04  26.34 
1976 05 30.37  12.96  21.66 
1976 06 29.02  11.87  20.44 
1976 07 29.53  12.18  20.85 
1976 08 31.26  12.02  21.64 
1976 09 35.13  17.10  26.11 
1976 10 37.91  24.16  31.04 
1976 11 40.24  26.27  33.25 
1976 12 37.82  25.25  31.53 
1977 01 36.46  25.44  30.95 
1977 02 34.95  25.46  30.20 
1977 03 32.83  24.63  28.73 
1977 04 33.59  21.05  27.32 
1977 05 32.21  17.09  24.65 
1977 06 28.34  11.29  19.81 
1977 07 28.66  10.18  19.42 
1977 08 32.40  13.20  22.80 
1977 09 34.50  18.67  26.58 
1977 10 38.15  24.03  31.09 
1977 11 38.66  26.05  32.36 
1977 12 36.45  24.74  30.59 
1978 01 34.75  24.61  29.68 
1978 02 99.99  24.82 -99.99 
1978 03 99.99  23.80 -99.99 
1978 04 35.77  19.37  27.57 
1978 05 34.30  21.07  27.68 
1978 06 30.88  15.71  23.29 
1978 07 29.54  14.11  21.82 
1978 08 32.50  17.10  24.80 
1978 09 34.80  18.58  26.68 
1978 10 36.79  23.63  30.21 
1978 11 38.31 -99.99 -99.99 
1978 12 37.29  24.86  31.07 
1979 01 36.86  24.74  30.80 
1979 02 35.50  23.99  29.75 
1979 03 35.18  23.55  29.36 
1979 04 36.75  21.39  29.07 
1979 05 31.79  19.41  25.60 
1979 06 31.18  15.01  23.09 
1979 07 30.22  13.20  21.71 
1979 08 33.63  17.45  25.54 
1979 09 36.37  22.65  29.50 
1979 10 38.29  24.39  31.34 
1979 11 38.68  25.72  32.20 
1979 12 37.48  25.57  31.52 
1980 01 35.78  25.35  30.56 
1980 02 33.21  24.61  28.91 
1980 03 35.90 -99.99 -99.99 
1980 04 35.84 -99.99 -99.99 
1980 05 33.95 -99.99 -99.99 
1980 06 31.86 -99.99 -99.99 
1980 07 30.81  12.23  21.52 
1980 08 33.24  15.82  24.53 
1980 09 36.88  18.59  27.73 
1980 10 38.45  25.49  31.97 
1980 11 38.79  25.15  31.97 
1980 12 37.43  25.04  31.23 
