1969 12 99.99 -99.99  23.40 
1970 03 99.99 -99.99  23.40 
1970 04 99.99 -99.99  23.80 
1970 05 99.99 -99.99  23.50 
1970 06 99.99 -99.99  22.60 
1970 08 99.99 -99.99  22.60 
1970 09 99.99 -99.99  23.60 
1970 11 99.99 -99.99  24.00 
1970 12 99.99 -99.99  24.30 
1971 02 99.99 -99.99  24.10 
1971 03 99.99 -99.99  25.00 
1971 04 99.99 -99.99  24.50 
1971 05 99.99 -99.99  24.70 
1971 07 99.99 -99.99  23.40 
1971 08 99.99 -99.99  24.70 
1971 09 99.99 -99.99  24.40 
1971 10 99.99 -99.99  23.30 
1971 11 99.99 -99.99  24.20 
1971 12 99.99 -99.99  24.30 
1972 01 99.99 -99.99  23.20 
1972 02 99.99 -99.99  24.00 
1972 03 99.99 -99.99  24.50 
1972 04 99.99 -99.99  25.40 
1972 05 99.99 -99.99  25.30 
1972 06 99.99 -99.99  24.50 
1972 07 99.99 -99.99  23.90 
1972 08 99.99 -99.99  24.70 
1972 09 99.99 -99.99  25.40 
1972 10 99.99 -99.99  25.10 
1972 11 99.99 -99.99  24.30 
1972 12 99.99 -99.99  25.00 
1973 01 99.99 -99.99  24.60 
1973 02 99.99 -99.99  25.00 
1973 03 99.99 -99.99  25.00 
1973 05 99.99 -99.99  25.00 
1973 06 99.99 -99.99  25.10 
1973 07 99.99 -99.99  24.50 
1973 08 99.99 -99.99  25.70 
1973 09 99.99 -99.99  25.00 
1973 11 99.99 -99.99  24.70 
1974 01 99.99 -99.99  24.40 
1974 03 99.99 -99.99  24.20 
1974 04 99.99 -99.99  24.10 
1974 07 99.99 -99.99  22.90 
1974 08 99.99 -99.99  25.50 
1974 10 99.99 -99.99  24.60 
1981 05 99.99 -99.99  24.50 
1981 06 99.99 -99.99  24.60 
1981 07 99.99 -99.99  22.60 
1981 09 99.99 -99.99  25.60 
1986 02 99.99 -99.99  26.60 
