1971 07 99.99 -99.99  35.00 
1971 08 99.99 -99.99  29.30 
1971 10 99.99 -99.99  22.80 
1972 01 99.99 -99.99   6.20 
1972 02 99.99 -99.99   7.80 
1972 03 99.99 -99.99  14.80 
1972 05 99.99 -99.99  25.60 
1972 06 99.99 -99.99  33.00 
1972 07 99.99 -99.99  30.20 
1972 08 99.99 -99.99  35.50 
1972 09 99.99 -99.99  30.90 
1972 10 99.99 -99.99  25.70 
1972 11 99.99 -99.99  14.70 
1972 12 99.99 -99.99   5.50 
1973 02 99.99 -99.99  13.70 
1973 03 99.99 -99.99  16.20 
1973 04 99.99 -99.99  21.10 
1973 05 99.99 -99.99  28.60 
1973 06 99.99 -99.99  31.60 
1973 07 99.99 -99.99  34.90 
1973 08 99.99 -99.99  35.59 
1973 09 99.99 -99.99  31.20 
1973 12 99.99 -99.99   8.70 
1974 02 99.99 -99.99   8.70 
1974 03 99.99 -99.99  14.50 
1974 04 99.99 -99.99  19.50 
1974 05 99.99 -99.99  26.30 
1974 06 99.99 -99.99  34.70 
1974 08 99.99 -99.99  34.09 
1974 10 99.99 -99.99  26.20 
1974 11 99.99 -99.99  15.30 
1975 01 99.99 -99.99   6.70 
1975 02 99.99 -99.99   9.39 
1975 03 99.99 -99.99  15.70 
1975 04 99.99 -99.99  22.30 
1975 05 99.99 -99.99  28.40 
1975 06 99.99 -99.99  33.20 
