1964 04 99.99 -99.99  28.10 
1964 05 99.99 -99.99  29.10 
1964 06 99.99 -99.99  28.80 
1964 07 99.99 -99.99  27.90 
1964 08 99.99 -99.99  28.60 
1964 09 99.99 -99.99  28.60 
1964 10 99.99 -99.99  27.90 
1964 11 99.99 -99.99  24.70 
1964 12 99.99 -99.99  21.30 
1965 01 99.99 -99.99  19.79 
1965 02 99.99 -99.99  21.90 
1965 03 99.99 -99.99  25.60 
1965 04 99.99 -99.99  28.20 
1965 05 99.99 -99.99  29.40 
1965 06 99.99 -99.99  28.40 
1965 07 99.99 -99.99  28.10 
1965 08 99.99 -99.99  27.70 
1965 09 99.99 -99.99  28.80 
1965 10 99.99 -99.99  28.10 
1965 11 99.99 -99.99  24.70 
1965 12 99.99 -99.99  21.10 
1966 01 99.99 -99.99  20.20 
1966 02 99.99 -99.99  23.80 
1966 03 99.99 -99.99  27.20 
1966 04 99.99 -99.99  29.70 
1966 05 99.99 -99.99  30.50 
1966 06 99.99 -99.99  28.70 
1966 07 99.99 -99.99  31.00 
1966 08 99.99 -99.99  28.70 
1966 09 99.99 -99.99  29.10 
1966 10 99.99 -99.99  27.20 
1966 11 99.99 -99.99  25.00 
1967 02 99.99 -99.99  23.10 
1967 03 99.99 -99.99  25.30 
1967 04 99.99 -99.99  27.60 
1967 05 99.99 -99.99  29.40 
1967 06 99.99 -99.99  29.20 
1967 07 99.99 -99.99  28.90 
1967 08 99.99 -99.99  29.10 
1967 09 99.99 -99.99  28.80 
1967 11 99.99 -99.99  23.30 
1967 12 99.99 -99.99  20.90 
1968 01 99.99 -99.99  19.79 
1968 02 99.99 -99.99  21.30 
1968 03 99.99 -99.99  26.70 
1968 04 99.99 -99.99  27.90 
1968 05 99.99 -99.99  29.30 
1968 06 99.99 -99.99  27.70 
1968 07 99.99 -99.99  28.80 
1968 08 99.99 -99.99  28.90 
1968 09 99.99 -99.99  29.60 
1968 10 99.99 -99.99  27.80 
1968 11 99.99 -99.99  24.40 
1968 12 99.99 -99.99  20.90 
