1971 01 -7.53 -20.56 -14.04 
1971 02 13.81 -26.55 -20.18 
1971 03 -8.64 -24.35 -16.49 
1971 04  -.99 -15.45  -8.22 
1971 05  6.30  -3.73   1.28 
1971 06 14.46   2.97   8.71 
1971 07 17.36   5.53  11.44 
1971 08 14.94   5.77  10.35 
1971 09  7.26   -.55   3.35 
1971 10   .-2  -7.43  -3.72 
1971 11 -7.82 -19.59 -13.70 
1971 12 -7.55 -19.78 -13.66 
1972 01 -7.70 -17.48 -12.59 
1972 02 -8.43 -20.79 -14.61 
1972 03 -3.64 -15.16  -9.39 
1972 04   . 7  -8.37  -4.15 
1972 05  5.60  -2.08   1.75 
1972 06 18.51   6.36  12.43 
1972 07 22.62   9.09  15.85 
1972 08 17.45   5.38  11.41 
1972 09  8.35    .63   4.49 
1972 10  1.26  -5.28  -2.01 
1972 11 -6.59 -13.46 -10.02 
1972 12 -1.07  -6.84  -3.95 
1973 01 -6.61 -17.29 -11.95 
1973 02 -8.87 -19.81 -14.34 
1973 03 -3.44 -15.74  -9.59 
1973 04  1.30  -8.21  -3.45 
1973 05  6.65  -1.64   2.50 
1973 06 17.12   6.65  11.89 
1973 07 22.95   7.69  15.32 
1973 08 14.68   3.52   9.10 
1973 09  6.77  -3.35   1.71 
1973 10 -1.55 -10.29  -5.92 
1973 11 -8.95 -19.09 -14.02 
1973 12 12.52 -25.82 -19.17 
