1968 12 31.84  24.82  28.33 
1969 01 31.29  24.82  28.05 
1969 02 32.02  24.85  28.43 
1969 04 32.34  25.26  28.80 
1969 05 31.81  25.31  28.56 
1969 06 32.50  24.93  28.72 
1969 08 29.10  22.14  25.62 
1970 04 31.76  21.85  26.80 
1970 05 31.35  24.27  27.81 
1970 06 30.98  24.68  27.83 
1970 07 30.06  24.48  27.27 
1971 01 30.60  20.64  25.62 
1971 03 30.68  21.61  26.14 
1971 04 30.94  22.55  26.74 
1971 05 30.82  22.40  26.61 
1971 06 30.32  22.04  26.18 
1971 07 29.56  21.77  25.66 
1971 08 29.64  21.68  25.66 
1971 10 30.00  21.72  25.86 
1971 11 30.17  21.86  26.01 
1971 12 29.71  20.69  25.20 
1972 06 31.04  22.72  26.88 
1972 07 30.70  21.59  26.14 
1973 03 31.78  22.28  27.03 
1973 04 31.16  21.53  26.34 
1974 01 29.36 -99.99 -99.99 
1976 08 30.72  21.21  25.96 
1976 10 31.78  21.83  26.80 
