1961 01 99.99 -99.99  22.60 
1961 02 99.99 -99.99  18.90 
1961 03 99.99 -99.99  12.00 
1961 04 99.99 -99.99   8.30 
1961 05 99.99 -99.99   8.00 
1961 06 99.99 -99.99   9.50 
1961 07 99.99 -99.99  13.40 
1961 08 99.99 -99.99  18.40 
1961 09 99.99 -99.99  23.20 
1961 10 99.99 -99.99  27.20 
1961 11 99.99 -99.99  25.30 
1961 12 99.99 -99.99  23.20 
1962 01 99.99 -99.99  21.20 
1962 02 99.99 -99.99  19.10 
1962 03 99.99 -99.99  13.20 
1962 04 99.99 -99.99   9.30 
1962 05 99.99 -99.99   9.20 
1962 06 99.99 -99.99  12.10 
1962 07 99.99 -99.99  12.60 
1962 08 99.99 -99.99  16.70 
1962 09 99.99 -99.99  21.40 
1962 10 99.99 -99.99  27.50 
1962 11 99.99 -99.99  25.70 
1962 12 99.99 -99.99  23.30 
1963 01 99.99 -99.99  21.90 
1963 02 99.99 -99.99  20.50 
1963 03 99.99 -99.99  13.50 
1963 04 99.99 -99.99  11.10 
1963 05 99.99 -99.99   4.40 
1963 06 99.99 -99.99   8.80 
1963 07 99.99 -99.99  13.80 
1963 08 99.99 -99.99  18.40 
1963 09 99.99 -99.99  22.40 
1963 10 99.99 -99.99  26.00 
1963 11 99.99 -99.99  23.30 
1963 12 99.99 -99.99  23.60 
1964 01 99.99 -99.99  21.70 
1964 02 99.99 -99.99  20.10 
1964 03 99.99 -99.99  14.70 
1964 04 99.99 -99.99   9.30 
1964 05 99.99 -99.99   8.89 
1964 06 99.99 -99.99   7.70 
1964 07 99.99 -99.99  12.80 
1964 08 99.99 -99.99  14.40 
1964 09 99.99 -99.99  20.90 
1964 10 99.99 -99.99  26.40 
1964 11 99.99 -99.99  24.40 
1964 12 99.99 -99.99  22.30 
1965 01 99.99 -99.99  22.90 
1965 02 99.99 -99.99  20.10 
1965 03 99.99 -99.99  14.90 
1965 04 99.99 -99.99  10.30 
1966 05 99.99 -99.99   7.90 
1966 06 99.99 -99.99  10.30 
1966 07 99.99 -99.99  12.30 
1966 08 99.99 -99.99  16.90 
1966 09 99.99 -99.99  21.70 
1966 10 99.99 -99.99  27.20 
1966 11 99.99 -99.99  24.20 
1966 12 99.99 -99.99  22.80 
1967 01 99.99 -99.99  22.30 
1967 02 99.99 -99.99  17.79 
1967 03 99.99 -99.99  12.90 
1967 04 99.99 -99.99   9.20 
1968 05 99.99 -99.99   7.60 
1968 06 99.99 -99.99   8.39 
1968 07 99.99 -99.99  16.60 
1968 08 99.99 -99.99  17.50 
1968 09 99.99 -99.99  21.40 
1968 10 99.99 -99.99  27.20 
1968 11 99.99 -99.99  24.50 
1968 12 99.99 -99.99  23.70 
1969 01 99.99 -99.99  22.50 
1969 02 99.99 -99.99  19.20 
1969 03 99.99 -99.99  15.20 
1969 04 99.99 -99.99  12.50 
1969 05 99.99 -99.99   8.10 
1969 06 99.99 -99.99   9.89 
1969 07 99.99 -99.99  12.20 
1969 08 99.99 -99.99  21.50 
1969 09 99.99 -99.99  25.00 
1969 10 99.99 -99.99  26.30 
1969 11 99.99 -99.99  24.70 
1969 12 99.99 -99.99  23.10 
1970 01 99.99 -99.99  21.80 
1970 02 99.99 -99.99  19.70 
1970 05 99.99 -99.99  11.70 
1970 06 99.99 -99.99  11.40 
1970 07 99.99 -99.99  18.70 
1970 08 99.99 -99.99  22.70 
1970 09 99.99 -99.99  28.70 
1970 10 99.99 -99.99  32.30 
1970 11 99.99 -99.99  29.50 
1970 12 99.99 -99.99  28.80 
