1973 01 99.99 -99.99  27.00 
1973 02 99.99 -99.99  27.80 
1973 03 99.99 -99.99  27.70 
1973 04 99.99 -99.99  26.60 
1973 05 99.99 -99.99  24.30 
1973 07 99.99 -99.99  21.00 
1973 08 99.99 -99.99  19.79 
1973 09 99.99 -99.99  22.40 
1973 10 99.99 -99.99  24.40 
1973 12 99.99 -99.99  23.60 
1974 01 99.99 -99.99  24.90 
1974 02 99.99 -99.99  25.70 
1974 04 99.99 -99.99  27.90 
1974 05 99.99 -99.99  25.70 
1974 06 99.99 -99.99  22.20 
1974 07 99.99 -99.99  20.90 
1974 08 99.99 -99.99  21.20 
1974 09 99.99 -99.99  21.90 
1974 10 99.99 -99.99  23.10 
1974 11 99.99 -99.99  23.70 
1974 12 99.99 -99.99  23.60 
1975 01 99.99 -99.99  25.20 
1975 02 99.99 -99.99  25.20 
1975 03 99.99 -99.99  26.50 
1976 10 99.99 -99.99  22.50 
1976 11 99.99 -99.99  23.80 
1977 02 99.99 -99.99  26.20 
1977 08 99.99 -99.99  20.80 
1977 12 99.99 -99.99  24.60 
1978 03 99.99 -99.99  25.10 
1978 04 99.99 -99.99  23.50 
1978 06 99.99 -99.99  20.20 
1979 01 99.99 -99.99  26.60 
1979 02 99.99 -99.99  26.30 
1979 05 99.99 -99.99  25.30 
1979 08 99.99 -99.99  20.00 
1979 11 99.99 -99.99  23.60 
1979 12 99.99 -99.99  25.10 
1980 01 99.99 -99.99  25.10 
1980 07 99.99 -99.99  18.60 
1981 03 99.99 -99.99  26.40 
1981 06 99.99 -99.99  19.40 
1981 08 99.99 -99.99  20.20 
1981 09 99.99 -99.99  22.20 
1981 10 99.99 -99.99  24.20 
1982 10 99.99 -99.99  23.30 
