1961 01 99.99 -99.99  17.70 
1961 02 99.99 -99.99  17.50 
1961 03 99.99 -99.99  16.79 
1961 04 99.99 -99.99  14.20 
1961 05 99.99 -99.99  10.70 
1961 06 99.99 -99.99  11.30 
1961 07 99.99 -99.99  11.00 
1961 08 99.99 -99.99  11.30 
1961 09 99.99 -99.99  13.20 
1961 10 99.99 -99.99  11.70 
1961 11 99.99 -99.99  14.30 
1961 12 99.99 -99.99  15.00 
1962 01 99.99 -99.99  16.70 
1962 02 99.99 -99.99  17.50 
1962 03 99.99 -99.99  16.50 
1962 04 99.99 -99.99  15.00 
1962 05 99.99 -99.99  12.10 
1962 06 99.99 -99.99  11.20 
1962 07 99.99 -99.99  11.80 
1962 08 99.99 -99.99  12.30 
1962 09 99.99 -99.99  12.30 
1962 10 99.99 -99.99  13.30 
1962 11 99.99 -99.99  14.50 
1962 12 99.99 -99.99  17.10 
1963 01 99.99 -99.99  17.10 
1963 02 99.99 -99.99  17.60 
1963 03 99.99 -99.99  14.50 
1963 04 99.99 -99.99  13.00 
1963 05 99.99 -99.99  12.10 
1963 06 99.99 -99.99  10.90 
1963 07 99.99 -99.99   9.20 
1963 08 99.99 -99.99  12.30 
1963 09 99.99 -99.99  15.90 
1963 10 99.99 -99.99  14.80 
1963 11 99.99 -99.99  15.90 
1963 12 99.99 -99.99  17.40 
1964 01 99.99 -99.99  16.60 
1964 02 99.99 -99.99  17.10 
1964 03 99.99 -99.99  16.79 
1964 04 99.99 -99.99  13.60 
1964 05 99.99 -99.99  13.20 
1964 06 99.99 -99.99   9.30 
1964 07 99.99 -99.99  10.20 
1964 08 99.99 -99.99   9.60 
1964 09 99.99 -99.99  11.20 
1964 10 99.99 -99.99  12.50 
1964 11 99.99 -99.99  14.00 
1964 12 99.99 -99.99  16.79 
1965 01 99.99 -99.99  17.60 
1965 02 99.99 -99.99  18.10 
1965 03 99.99 -99.99  17.70 
1965 04 99.99 -99.99  14.20 
1965 05 99.99 -99.99  11.40 
1965 06 99.99 -99.99   8.00 
1965 07 99.99 -99.99  11.30 
1965 08 99.99 -99.99  12.80 
1965 09 99.99 -99.99  13.50 
1965 10 99.99 -99.99  12.30 
1965 11 99.99 -99.99  13.90 
1965 12 99.99 -99.99  15.90 
1966 01 99.99 -99.99  17.20 
1966 02 99.99 -99.99  15.90 
1966 03 99.99 -99.99  18.29 
1966 04 99.99 -99.99  13.60 
1966 05 99.99 -99.99  11.80 
1966 06 99.99 -99.99  11.40 
1966 07 99.99 -99.99   9.80 
1966 08 99.99 -99.99  10.50 
1966 09 99.99 -99.99  12.60 
1966 10 99.99 -99.99  13.10 
1966 12 99.99 -99.99  17.70 
1967 01 99.99 -99.99  17.10 
1967 02 99.99 -99.99  17.10 
1967 03 99.99 -99.99  17.00 
1967 04 99.99 -99.99  13.90 
