1967 01 99.99 -99.99  11.40 
1967 02 99.99 -99.99  12.90 
1967 03 99.99 -99.99  13.40 
1967 04 99.99 -99.99  12.80 
1967 06 99.99 -99.99  13.10 
1967 09 99.99 -99.99  12.20 
1967 11 99.99 -99.99  11.40 
1967 12 99.99 -99.99  10.80 
1968 05 99.99 -99.99  12.80 
1968 06 99.99 -99.99  12.80 
1968 07 99.99 -99.99  12.70 
1968 08 99.99 -99.99  12.60 
1968 09 99.99 -99.99  12.50 
1968 10 99.99 -99.99  12.00 
1968 11 99.99 -99.99  11.20 
1968 12 99.99 -99.99  11.60 
1969 01 99.99 -99.99  12.40 
1969 02 99.99 -99.99  12.30 
1969 03 99.99 -99.99  12.80 
1969 04 99.99 -99.99  13.60 
1969 05 99.99 -99.99  13.90 
1969 06 99.99 -99.99  13.50 
1969 07 99.99 -99.99  12.70 
1969 08 99.99 -99.99  12.60 
1969 09 99.99 -99.99  12.50 
1969 10 99.99 -99.99  12.20 
1969 11 99.99 -99.99  11.60 
1970 01 99.99 -99.99  12.60 
1970 02 99.99 -99.99  13.30 
1970 03 99.99 -99.99  13.00 
1970 04 99.99 -99.99  13.40 
1970 05 99.99 -99.99  14.30 
1970 06 99.99 -99.99  14.10 
1970 07 99.99 -99.99  13.30 
1970 08 99.99 -99.99  12.40 
1970 09 99.99 -99.99  12.30 
1970 10 99.99 -99.99  11.90 
1970 11 99.99 -99.99  10.90 
1970 12 99.99 -99.99  11.80 
1971 01 99.99 -99.99  12.50 
1971 02 99.99 -99.99  13.30 
1971 03 99.99 -99.99  13.00 
1971 04 99.99 -99.99  13.20 
1971 05 99.99 -99.99  13.40 
1971 06 99.99 -99.99  13.60 
1971 07 99.99 -99.99  12.80 
1971 08 99.99 -99.99  12.70 
1971 09 99.99 -99.99  12.40 
1971 10 99.99 -99.99  11.60 
1971 11 99.99 -99.99  10.80 
1971 12 99.99 -99.99  11.00 
1972 01 99.99 -99.99  12.40 
1972 02 99.99 -99.99  12.60 
1972 03 99.99 -99.99  12.90 
1972 04 99.99 -99.99  12.70 
1972 05 99.99 -99.99  13.70 
1972 06 99.99 -99.99  13.90 
1972 07 99.99 -99.99  13.50 
1972 08 99.99 -99.99  12.90 
1972 09 99.99 -99.99  13.40 
1972 10 99.99 -99.99  12.10 
1972 11 99.99 -99.99  12.30 
1972 12 99.99 -99.99  12.60 
1973 01 99.99 -99.99  13.60 
1973 02 99.99 -99.99  14.30 
1973 03 99.99 -99.99  15.40 
1973 04 99.99 -99.99  14.80 
1973 05 99.99 -99.99  14.20 
1973 06 99.99 -99.99  14.40 
1973 07 99.99 -99.99  13.40 
1973 08 99.99 -99.99  13.00 
1973 09 99.99 -99.99  12.90 
1973 10 99.99 -99.99  12.20 
1973 11 99.99 -99.99  11.80 
1973 12 99.99 -99.99  11.20 
1974 01 99.99 -99.99  12.30 
1974 02 99.99 -99.99  13.20 
1974 03 99.99 -99.99  12.30 
1974 04 99.99 -99.99  13.50 
1974 05 99.99 -99.99  13.20 
1974 06 99.99 -99.99  13.50 
1974 07 99.99 -99.99  13.10 
1974 08 99.99 -99.99  13.10 
1974 09 99.99 -99.99  12.50 
1974 10 99.99 -99.99  12.00 
1974 11 99.99 -99.99  11.20 
1974 12 99.99 -99.99  11.70 
