1967 04 99.99 -99.99  12.70 
1967 05 99.99 -99.99  10.60 
1967 06 99.99 -99.99   5.00 
1967 07 99.99 -99.99   6.30 
1967 08 99.99 -99.99   7.00 
1967 09 99.99 -99.99   9.20 
1967 10 99.99 -99.99  11.90 
1967 11 99.99 -99.99  14.40 
1967 12 99.99 -99.99  18.79 
1968 01 99.99 -99.99  19.60 
1968 02 99.99 -99.99  18.29 
1968 03 99.99 -99.99  15.60 
1968 08 99.99 -99.99   9.00 
1968 09 99.99 -99.99  10.80 
1968 10 99.99 -99.99  14.10 
1968 11 99.99 -99.99  14.90 
1968 12 99.99 -99.99  15.70 
1969 01 99.99 -99.99  18.20 
1969 03 99.99 -99.99  16.00 
1969 04 99.99 -99.99  12.20 
1969 05 99.99 -99.99   9.30 
1969 06 99.99 -99.99   7.20 
1969 07 99.99 -99.99   9.00 
1969 08 99.99 -99.99   7.30 
1969 09 99.99 -99.99   9.00 
1969 10 99.99 -99.99  10.10 
1969 11 99.99 -99.99  14.60 
1969 12 99.99 -99.99  18.60 
1970 01 99.99 -99.99  19.00 
1970 02 99.99 -99.99  19.20 
1970 03 99.99 -99.99  16.60 
1970 04 99.99 -99.99  13.80 
1970 05 99.99 -99.99   9.60 
1970 06 99.99 -99.99   7.00 
1970 07 99.99 -99.99   9.20 
1970 08 99.99 -99.99   6.90 
1970 10 99.99 -99.99  12.20 
1970 11 99.99 -99.99  14.30 
1970 12 99.99 -99.99  16.29 
1971 01 99.99 -99.99  17.10 
1971 02 99.99 -99.99  24.00 
1971 03 99.99 -99.99  14.70 
1971 04 99.99 -99.99  13.40 
1971 05 99.99 -99.99   9.89 
1971 06 99.99 -99.99   6.50 
1971 07 99.99 -99.99   9.10 
1971 08 99.99 -99.99   7.50 
1971 09 99.99 -99.99   9.70 
1971 10 99.99 -99.99  13.00 
1972 01 99.99 -99.99  19.10 
1972 02 99.99 -99.99  19.20 
1972 03 99.99 -99.99  13.20 
1972 04 99.99 -99.99  12.80 
1972 05 99.99 -99.99  10.30 
1972 06 99.99 -99.99   8.70 
1972 07 99.99 -99.99   6.50 
1972 09 99.99 -99.99   9.60 
1972 10 99.99 -99.99  10.40 
1972 12 99.99 -99.99  18.79 
1973 01 99.99 -99.99  17.90 
1973 03 99.99 -99.99  15.90 
1973 04 99.99 -99.99  12.00 
1973 05 99.99 -99.99   9.00 
1973 06 99.99 -99.99   7.70 
1973 07 99.99 -99.99   6.10 
1973 08 99.99 -99.99   7.70 
1973 09 99.99 -99.99   9.10 
1973 10 99.99 -99.99  11.60 
1973 11 99.99 -99.99  14.80 
1973 12 99.99 -99.99  18.60 
1974 01 99.99 -99.99  17.90 
1974 02 99.99 -99.99  17.90 
1974 03 99.99 -99.99  14.20 
1974 04 99.99 -99.99  12.50 
1974 05 99.99 -99.99  10.20 
1974 06 99.99 -99.99   7.00 
1974 07 99.99 -99.99   6.30 
1974 08 99.99 -99.99   6.90 
1974 09 99.99 -99.99   9.20 
1974 10 99.99 -99.99  10.70 
1974 11 99.99 -99.99  14.10 
1974 12 99.99 -99.99  16.60 
1975 01 99.99 -99.99  19.70 
1975 02 99.99 -99.99  16.00 
