1970 01 99.99 -99.99   9.18 
1970 02 99.99 -99.99  12.80 
1970 03 99.99 -99.99  17.20 
1970 04 99.99 -99.99  23.90 
1970 05 99.99 -99.99  27.50 
1970 06 99.99 -99.99  32.40 
1970 07 99.99 -99.99  34.29 
1970 08 99.99 -99.99  34.00 
1970 10 99.99 -99.99  21.00 
1970 11 99.99 -99.99  16.29 
1970 12 99.99 -99.99   6.20 
1971 01 99.99 -99.99   7.80 
1971 03 99.99 -99.99  15.30 
1971 04 99.99 -99.99  17.29 
1971 05 99.99 -99.99  27.70 
1971 07 99.99 -99.99  32.79 
1971 08 99.99 -99.99  31.70 
1971 09 99.99 -99.99  29.00 
1971 10 99.99 -99.99  20.60 
1971 11 99.99 -99.99  13.20 
1972 01 99.99 -99.99   5.20 
1972 03 99.99 -99.99  14.40 
1972 05 99.99 -99.99  25.00 
1973 04 99.99 -99.99  20.80 
1973 06 99.99 -99.99  31.20 
1973 08 99.99 -99.99  35.70 
1973 09 99.99 -99.99  30.60 
1973 10 99.99 -99.99  24.90 
1974 03 99.99 -99.99  15.70 
1974 04 99.99 -99.99  20.39 
1974 06 99.99 -99.99  34.70 
1974 07 99.99 -99.99  35.20 
1974 08 99.99 -99.99  33.50 
1974 11 99.99 -99.99  13.90 
1974 12 99.99 -99.99   9.18 
1975 01 99.99 -99.99   7.50 
1975 03 99.99 -99.99  16.29 
1975 04 99.99 -99.99  22.30 
1975 05 99.99 -99.99  29.30 
