1990 09 99.99 -99.99  23.90 
1990 12 99.99 -99.99  23.90 
1991 03 99.99 -99.99  27.40 
1991 04 99.99 -99.99  27.70 
1991 10 99.99 -99.99  24.00 
1992 07 99.99 -99.99  23.70 
1992 09 99.99 -99.99  24.00 
1992 10 99.99 -99.99  24.60 
1992 12 99.99 -99.99  23.80 
1993 01 99.99 -99.99  22.10 
1993 04 99.99 -99.99  26.60 
1993 08 99.99 -99.99  24.50 
1993 09 99.99 -99.99  24.30 
1993 10 99.99 -99.99  24.90 
1993 12 99.99 -99.99  22.30 
1994 01 99.99 -99.99  22.50 
1994 02 99.99 -99.99  25.20 
1994 03 99.99 -99.99  27.40 
1994 05 99.99 -99.99  25.90 
1994 09 99.99 -99.99  25.00 
1994 10 99.99 -99.99  24.30 
1996 03 99.99 -99.99  27.10 
1996 06 99.99 -99.99  25.30 
1996 08 99.99 -99.99  24.20 
1997 01 99.99 -99.99  25.60 
1997 03 99.99 -99.99  27.50 
