1961 01 99.99 -99.99  23.80 
1961 02 99.99 -99.99  23.70 
1961 03 99.99 -99.99  23.70 
1961 04 99.99 -99.99  25.40 
1961 05 99.99 -99.99  26.10 
1961 06 99.99 -99.99  26.20 
1961 07 99.99 -99.99  26.20 
1961 08 99.99 -99.99  26.40 
1961 09 99.99 -99.99  26.50 
1961 10 99.99 -99.99  25.50 
1961 11 99.99 -99.99  22.90 
1961 12 99.99 -99.99  22.50 
1962 01 99.99 -99.99  23.10 
1962 03 99.99 -99.99  23.70 
1962 04 99.99 -99.99  24.90 
1962 05 99.99 -99.99  24.50 
1962 06 99.99 -99.99  26.30 
1962 07 99.99 -99.99  26.70 
1962 09 99.99 -99.99  26.80 
1962 10 99.99 -99.99  26.30 
1962 11 99.99 -99.99  24.60 
1962 12 99.99 -99.99  23.50 
1963 01 99.99 -99.99  22.30 
1963 02 99.99 -99.99  24.10 
1963 03 99.99 -99.99  24.00 
1963 04 99.99 -99.99  24.50 
1963 05 99.99 -99.99  24.80 
1963 06 99.99 -99.99  26.60 
1963 07 99.99 -99.99  26.30 
1963 09 99.99 -99.99  26.90 
1963 10 99.99 -99.99  25.80 
1963 11 99.99 -99.99  24.50 
1963 12 99.99 -99.99  24.90 
1964 01 99.99 -99.99  23.40 
1964 02 99.99 -99.99  24.70 
1964 03 99.99 -99.99  24.80 
1964 04 99.99 -99.99  24.50 
1964 05 99.99 -99.99  25.80 
1964 06 99.99 -99.99  26.00 
1964 07 99.99 -99.99  26.10 
1964 08 99.99 -99.99  26.60 
1964 09 99.99 -99.99  26.60 
1964 10 99.99 -99.99  26.30 
1964 11 99.99 -99.99  24.20 
1964 12 99.99 -99.99  21.70 
1965 01 99.99 -99.99  21.40 
1966 01 99.99 -99.99  23.50 
1966 02 99.99 -99.99  22.90 
1966 07 99.99 -99.99  26.80 
1966 08 99.99 -99.99  26.90 
1966 09 99.99 -99.99  27.10 
1966 10 99.99 -99.99  25.90 
1966 11 99.99 -99.99  23.10 
1966 12 99.99 -99.99  22.10 
1967 01 99.99 -99.99  22.10 
1967 02 99.99 -99.99  22.50 
1967 03 99.99 -99.99  22.20 
1967 04 99.99 -99.99  23.10 
1967 05 99.99 -99.99  25.60 
1967 06 99.99 -99.99  26.70 
1967 07 99.99 -99.99  25.90 
1967 08 99.99 -99.99  27.00 
1967 09 99.99 -99.99  26.70 
1967 10 99.99 -99.99  26.10 
1967 11 99.99 -99.99  24.50 
1968 02 99.99 -99.99  22.20 
1968 05 99.99 -99.99  25.80 
1968 07 99.99 -99.99  25.50 
