1964 01 99.99 -99.99  26.90 
1964 02 99.99 -99.99  27.40 
1964 03 99.99 -99.99  26.60 
1964 04 99.99 -99.99  24.00 
1964 05 99.99 -99.99  19.60 
1964 06 99.99 -99.99  15.20 
1964 07 99.99 -99.99  15.00 
1964 08 99.99 -99.99  19.20 
1964 09 99.99 -99.99  22.60 
1964 10 99.99 -99.99  26.10 
1964 11 99.99 -99.99  26.10 
1964 12 99.99 -99.99  25.80 
1966 01 99.99 -99.99  25.00 
1966 02 99.99 -99.99  24.60 
1966 03 99.99 -99.99  23.30 
1966 04 99.99 -99.99  22.10 
1966 05 99.99 -99.99  19.00 
1966 06 99.99 -99.99  17.60 
1966 07 99.99 -99.99  17.40 
1966 08 99.99 -99.99  19.29 
1966 09 99.99 -99.99  22.60 
1966 10 99.99 -99.99  27.20 
1966 11 99.99 -99.99  27.90 
1966 12 99.99 -99.99  26.70 
1967 01 99.99 -99.99  24.90 
1967 02 99.99 -99.99  23.00 
1967 03 99.99 -99.99  22.60 
1967 04 99.99 -99.99  21.80 
1967 05 99.99 -99.99  19.60 
1967 06 99.99 -99.99  16.79 
1967 07 99.99 -99.99  15.90 
1967 08 99.99 -99.99  19.20 
1967 09 99.99 -99.99  23.50 
1967 10 99.99 -99.99  27.10 
1967 11 99.99 -99.99  23.70 
1967 12 99.99 -99.99  23.70 
1968 01 99.99 -99.99  24.20 
1968 02 99.99 -99.99  24.20 
1968 03 99.99 -99.99  23.10 
1968 04 99.99 -99.99  22.10 
1968 05 99.99 -99.99  19.20 
1968 06 99.99 -99.99  15.10 
1968 07 99.99 -99.99  17.70 
1968 08 99.99 -99.99  20.60 
1968 09 99.99 -99.99  23.80 
1968 10 99.99 -99.99  27.70 
1968 11 99.99 -99.99  24.40 
1968 12 99.99 -99.99  26.20 
