1991 07 99.99 -99.99  26.10 
1991 09 99.99 -99.99  26.50 
1991 10 99.99 -99.99  28.30 
1991 12 99.99 -99.99  27.20 
1992 04 99.99 -99.99  26.70 
1992 05 99.99 -99.99  26.90 
1992 06 99.99 -99.99  26.30 
1992 07 99.99 -99.99  25.90 
1992 08 99.99 -99.99  25.70 
1992 10 99.99 -99.99  26.80 
1992 11 99.99 -99.99  28.10 
1993 01 99.99 -99.99  27.70 
1993 03 99.99 -99.99  28.30 
1993 04 99.99 -99.99  26.80 
1993 05 99.99 -99.99  25.10 
1993 07 99.99 -99.99  25.50 
1993 09 99.99 -99.99  25.90 
1993 10 99.99 -99.99  26.90 
1993 11 99.99 -99.99  27.90 
1993 12 99.99 -99.99  27.60 
1994 03 99.99 -99.99  28.30 
1994 04 99.99 -99.99  27.50 
1994 07 99.99 -99.99  24.80 
1996 05 99.99 -99.99  26.70 
