1970 08 99.99 -99.99  27.90 
1970 09 99.99 -99.99  27.50 
1970 10 99.99 -99.99  27.50 
1970 11 99.99 -99.99  27.70 
1970 12 99.99 -99.99  26.70 
1971 01 99.99 -99.99  26.80 
1971 02 99.99 -99.99  27.20 
1971 03 99.99 -99.99  26.50 
1971 04 99.99 -99.99  26.80 
1971 05 99.99 -99.99  27.10 
1971 06 99.99 -99.99  27.20 
1971 07 99.99 -99.99  27.20 
1971 08 99.99 -99.99  27.40 
1971 09 99.99 -99.99  27.40 
1971 10 99.99 -99.99  27.40 
1971 11 99.99 -99.99  27.10 
1971 12 99.99 -99.99  26.50 
1972 01 99.99 -99.99  25.90 
1972 02 99.99 -99.99  26.70 
1972 03 99.99 -99.99  26.50 
1972 04 99.99 -99.99  26.80 
1972 05 99.99 -99.99  26.90 
1972 06 99.99 -99.99  27.90 
1972 07 99.99 -99.99  26.60 
1972 08 99.99 -99.99  27.30 
1972 09 99.99 -99.99  25.60 
1972 10 99.99 -99.99  25.80 
1972 11 99.99 -99.99  26.50 
1972 12 99.99 -99.99  25.10 
1973 01 99.99 -99.99  26.70 
