1961 01 99.99 -99.99  21.20 
1961 02 99.99 -99.99  21.90 
1961 03 99.99 -99.99  21.90 
1961 04 99.99 -99.99  20.50 
1961 05 99.99 -99.99  19.90 
1961 06 99.99 -99.99  19.60 
1961 07 99.99 -99.99  18.60 
1964 01 99.99 -99.99  20.40 
1964 02 99.99 -99.99  24.90 
1964 03 99.99 -99.99  25.20 
1964 04 99.99 -99.99  20.20 
1964 05 99.99 -99.99  19.70 
1964 06 99.99 -99.99  18.40 
1964 07 99.99 -99.99  16.90 
1964 08 99.99 -99.99  18.20 
1964 09 99.99 -99.99  18.90 
1964 10 99.99 -99.99  19.10 
1964 11 99.99 -99.99  19.79 
1964 12 99.99 -99.99  18.50 
1965 01 99.99 -99.99  20.50 
1965 02 99.99 -99.99  21.30 
1965 03 99.99 -99.99  21.10 
1965 04 99.99 -99.99  20.60 
1965 05 99.99 -99.99  19.10 
1965 06 99.99 -99.99  18.20 
1965 07 99.99 -99.99  18.10 
1965 08 99.99 -99.99  17.90 
1965 09 99.99 -99.99  19.70 
1965 10 99.99 -99.99  19.20 
1965 11 99.99 -99.99  19.10 
1965 12 99.99 -99.99  19.79 
1966 01 99.99 -99.99  20.70 
1966 02 99.99 -99.99  21.10 
1966 03 99.99 -99.99  20.50 
1966 04 99.99 -99.99  19.40 
1966 05 99.99 -99.99  19.50 
1966 06 99.99 -99.99  18.40 
1966 07 99.99 -99.99  17.70 
1966 08 99.99 -99.99  18.79 
1966 09 99.99 -99.99  19.70 
1966 10 99.99 -99.99  19.00 
1966 11 99.99 -99.99  19.00 
1966 12 99.99 -99.99  20.20 
1967 01 99.99 -99.99  20.40 
1967 02 99.99 -99.99  22.70 
1967 03 99.99 -99.99  22.50 
1967 04 99.99 -99.99  20.00 
1967 05 99.99 -99.99  19.00 
1967 06 99.99 -99.99  17.90 
1967 07 99.99 -99.99  17.70 
1967 08 99.99 -99.99  18.60 
1967 09 99.99 -99.99  19.90 
1967 10 99.99 -99.99  18.70 
1967 11 99.99 -99.99  18.79 
1967 12 99.99 -99.99  19.00 
1968 01 99.99 -99.99  20.40 
1968 02 99.99 -99.99  21.00 
1968 03 99.99 -99.99  20.00 
1968 04 99.99 -99.99  19.20 
1968 05 99.99 -99.99  18.90 
1968 06 99.99 -99.99  17.79 
1968 07 99.99 -99.99  16.40 
1968 08 99.99 -99.99  17.50 
1968 09 99.99 -99.99  19.29 
1968 10 99.99 -99.99  19.10 
1968 11 99.99 -99.99  18.90 
1968 12 99.99 -99.99  19.50 
1969 01 99.99 -99.99  20.70 
1969 02 99.99 -99.99  20.70 
1969 03 99.99 -99.99  21.20 
1969 04 99.99 -99.99  20.90 
1969 05 99.99 -99.99  19.40 
1969 06 99.99 -99.99  18.40 
1969 07 99.99 -99.99  17.79 
1969 08 99.99 -99.99  18.20 
1969 09 99.99 -99.99  19.70 
1969 10 99.99 -99.99  19.20 
1969 11 99.99 -99.99  19.50 
1969 12 99.99 -99.99  20.00 
1970 01 99.99 -99.99  20.80 
1970 02 99.99 -99.99  21.60 
1970 03 99.99 -99.99  19.79 
1970 04 99.99 -99.99  20.10 
1970 05 99.99 -99.99  19.20 
1970 06 99.99 -99.99  18.00 
1970 07 99.99 -99.99  17.90 
1970 08 99.99 -99.99  18.40 
1970 09 99.99 -99.99  19.00 
1970 10 99.99 -99.99  18.90 
1970 11 99.99 -99.99  19.60 
1970 12 99.99 -99.99  20.20 
