1987 01 99.99 -99.99  26.00 
1987 02 99.99 -99.99  26.40 
1987 03 99.99 -99.99  27.10 
1987 06 99.99 -99.99  26.50 
1987 07 99.99 -99.99  25.90 
1987 09 99.99 -99.99  25.90 
1987 12 99.99 -99.99  25.60 
1988 01 99.99 -99.99  25.70 
1988 02 99.99 -99.99  26.00 
1988 03 99.99 -99.99  26.00 
1988 04 99.99 -99.99  26.10 
1988 05 99.99 -99.99  25.90 
1988 07 99.99 -99.99  24.90 
1988 12 99.99 -99.99  24.50 
1989 02 99.99 -99.99  25.90 
1989 03 99.99 -99.99  25.70 
1989 07 99.99 -99.99  25.00 
1989 08 99.99 -99.99  24.80 
1989 09 99.99 -99.99  24.80 
1989 10 99.99 -99.99  25.00 
1989 11 99.99 -99.99  25.10 
1989 12 99.99 -99.99  24.90 
1990 01 99.99 -99.99  25.60 
1990 02 99.99 -99.99  25.70 
1990 03 99.99 -99.99  26.00 
1990 04 99.99 -99.99  25.80 
1990 05 99.99 -99.99  26.10 
1990 06 99.99 -99.99  25.80 
1990 07 99.99 -99.99  25.30 
1990 08 99.99 -99.99  25.10 
1990 09 99.99 -99.99  25.00 
1990 10 99.99 -99.99  25.00 
