1971 12 34.58  19.95  27.27 
1972 01 35.34  22.70  29.02 
1972 02 37.70  24.71  31.20 
1972 03 35.09  22.50  28.80 
1972 04 32.31  20.02  26.16 
1972 05 29.41  16.59  23.00 
1972 06 25.27  15.57  20.42 
1972 07 22.95  14.33  18.64 
1972 08 23.50  13.01  18.25 
1972 09 28.34  15.29  21.81 
1972 10 31.48  17.87  24.67 
1972 11 34.21  19.56  26.88 
1972 12 36.64  23.23  29.93 
1973 01 36.54  24.27  30.40 
1973 02 37.36  23.07  30.21 
1973 03 35.75  24.87  30.31 
1973 04 30.71  20.51  25.61 
1973 05 27.74  19.59  23.66 
1973 06 24.22  15.86  20.03 
1973 07 23.66  15.17  19.41 
1973 08 23.95  14.41  19.18 
1973 09 27.13  14.95  21.04 
1973 10 30.27  17.61  23.94 
1973 11 32.71  19.20  25.95 
1973 12 35.43  23.00  29.22 
1974 01 33.75  24.69  29.22 
1974 02 34.89  24.55  29.72 
1974 03 34.98  25.07  30.02 
1974 04 31.07  21.53  26.30 
1974 05 27.08  17.85  22.46 
1974 06 24.56  14.81  19.68 
1974 07 24.29  16.10  20.19 
1974 08 24.85  14.82  19.83 
1974 09 28.08  15.68  21.88 
1974 10 29.54  16.29  22.92 
1974 11 31.60  17.73  24.66 
1974 12 36.55  21.41  28.98 
1975 01 36.52  21.34  28.93 
1975 02 34.68  23.66  29.17 
1975 03 33.75  24.01  28.88 
1975 04 31.04  21.82  26.43 
1975 05 28.70  18.12  23.41 
1975 06 25.69  16.20  20.94 
1975 07 24.00  15.70  19.85 
1975 08 25.48  13.76  19.61 
1975 09 28.06  16.42  22.24 
1975 10 28.06  17.51  22.78 
1975 11 32.12  20.29  26.21 
1975 12 36.39  23.49  29.93 
1976 01 34.05  23.93  28.99 
1976 02 35.57  23.82  29.69 
1976 03 35.24  24.01  29.62 
1976 04 31.91  19.87  25.89 
1976 05 29.43  18.53  23.98 
1976 06 25.97  14.84  20.40 
