1969 06 99.99 -99.99  26.60 
1970 07 99.99 -99.99  25.70 
1970 08 99.99 -99.99  25.60 
1970 09 99.99 -99.99  25.40 
1970 10 99.99 -99.99  25.60 
1970 11 99.99 -99.99  25.20 
1971 01 99.99 -99.99  25.10 
1971 02 99.99 -99.99  25.30 
1971 03 99.99 -99.99  25.40 
1971 04 99.99 -99.99  25.20 
1971 06 99.99 -99.99  25.00 
1972 01 99.99 -99.99  25.10 
1972 04 99.99 -99.99  25.80 
1972 05 99.99 -99.99  25.50 
1972 06 99.99 -99.99  25.50 
1972 07 99.99 -99.99  25.70 
1972 08 99.99 -99.99  25.50 
1972 09 99.99 -99.99  25.30 
1972 11 99.99 -99.99  25.40 
1973 01 99.99 -99.99  25.60 
1973 02 99.99 -99.99  25.60 
1973 03 99.99 -99.99  25.60 
1973 04 99.99 -99.99  25.60 
1973 05 99.99 -99.99  26.00 
1973 06 99.99 -99.99  25.20 
1973 07 99.99 -99.99  25.50 
1973 09 99.99 -99.99  25.50 
1973 11 99.99 -99.99  26.40 
1974 01 99.99 -99.99  26.80 
1974 02 99.99 -99.99  26.60 
1974 06 99.99 -99.99  25.90 
1974 07 99.99 -99.99  25.60 
1974 08 99.99 -99.99  25.30 
1974 09 99.99 -99.99  25.40 
1974 10 99.99 -99.99  25.30 
1974 11 99.99 -99.99  25.40 
1974 12 99.99 -99.99  25.60 
1975 01 99.99 -99.99  25.40 
1975 02 99.99 -99.99  25.30 
1975 03 99.99 -99.99  25.50 
1975 04 99.99 -99.99  25.70 
1975 06 99.99 -99.99  25.70 
1975 07 99.99 -99.99  25.20 
1975 08 99.99 -99.99  22.90 
1975 09 99.99 -99.99  25.10 
1976 01 99.99 -99.99  25.40 
1976 02 99.99 -99.99  25.10 
1976 03 99.99 -99.99  25.60 
1976 04 99.99 -99.99  25.40 
1976 05 99.99 -99.99  25.00 
1976 06 99.99 -99.99  25.50 
1976 07 99.99 -99.99  25.40 
1976 08 99.99 -99.99  25.40 
1976 09 99.99 -99.99  25.50 
1976 10 99.99 -99.99  25.40 
1976 11 99.99 -99.99  25.90 
1976 12 99.99 -99.99  26.00 
1977 01 99.99 -99.99  26.10 
1977 02 99.99 -99.99  25.40 
1977 03 99.99 -99.99  26.20 
1977 04 99.99 -99.99  25.60 
1977 05 99.99 -99.99  25.40 
1977 06 99.99 -99.99  25.40 
1977 07 99.99 -99.99  25.60 
1977 08 99.99 -99.99  25.70 
1977 09 99.99 -99.99  25.70 
1977 11 99.99 -99.99  25.70 
1978 01 99.99 -99.99  26.10 
1978 03 99.99 -99.99  25.40 
1978 05 99.99 -99.99  25.80 
1978 06 99.99 -99.99  25.60 
1978 08 99.99 -99.99  26.30 
1978 09 99.99 -99.99  25.30 
1978 10 99.99 -99.99  25.30 
1978 11 99.99 -99.99  25.00 
1978 12 99.99 -99.99  25.60 
1979 01 99.99 -99.99  25.50 
1979 02 99.99 -99.99  24.70 
1979 03 99.99 -99.99  25.80 
1979 04 99.99 -99.99  25.60 
1979 05 99.99 -99.99  25.70 
1979 06 99.99 -99.99  26.00 
1979 07 99.99 -99.99  25.70 
1979 08 99.99 -99.99  26.20 
1979 09 99.99 -99.99  25.60 
1979 10 99.99 -99.99  25.80 
1979 11 99.99 -99.99  25.20 
1980 01 99.99 -99.99  26.30 
1980 02 99.99 -99.99  26.10 
1980 03 99.99 -99.99  26.70 
1980 04 99.99 -99.99  26.80 
1980 05 99.99 -99.99  26.40 
1980 06 99.99 -99.99  26.30 
1980 09 99.99 -99.99  25.60 
1981 01 99.99 -99.99  25.50 
1983 06 99.99 -99.99  27.20 
1983 09 99.99 -99.99  26.00 
1983 10 99.99 -99.99  26.00 
