1972 05 99.99   4.79 -99.99 
1972 06  9.26   2.01   5.63 
1972 07  6.68   1.89   4.28 
1972 08  8.78   2.88   5.83 
1972 09 12.81   4.17   8.49 
1972 10 14.04   4.52   9.28 
1972 11 17.06   5.48  11.27 
1972 12 23.12   8.35  15.73 
1973 01 25.14  11.03  18.08 
1973 02 21.70  10.87  16.28 
1973 03 16.68   7.19  11.93 
1973 04 99.99   7.36 -99.99 
1973 05 10.76   4.63   7.69 
1973 06  7.79   2.45   5.12 
1973 07  8.85   1.98   5.42 
1973 08  8.79   2.15   5.47 
1973 09 11.73   4.40   8.06 
1973 10 15.01   5.88  10.44 
1973 11 15.48   6.23  10.85 
1973 12 20.81   9.27  15.04 
1974 01 22.70  11.61  17.15 
1974 02 21.34  10.31  15.82 
1974 03 22.55  11.84  17.19 
1974 04 13.44   7.70  10.57 
1974 06  8.50   2.72   5.61 
1974 07  7.35 -99.99 -99.99 
1974 08  8.18 -99.99 -99.99 
