1983 12 99.99 -99.99  24.00 
1984 01 99.99 -99.99  23.80 
1984 02 99.99 -99.99  26.40 
1984 03 99.99 -99.99  27.90 
1984 04 99.99 -99.99  27.30 
1984 05 99.99 -99.99  26.50 
1984 06 99.99 -99.99  25.60 
1984 07 99.99 -99.99  24.50 
1984 08 99.99 -99.99  24.90 
1984 09 99.99 -99.99  25.00 
1984 10 99.99 -99.99  25.50 
1984 11 99.99 -99.99  25.60 
1984 12 99.99 -99.99  24.10 
1985 01 99.99 -99.99  25.50 
1985 02 99.99 -99.99  26.40 
1985 03 99.99 -99.99  27.20 
1985 04 99.99 -99.99  27.70 
1985 05 99.99 -99.99  26.90 
1985 06 99.99 -99.99  26.30 
1985 07 99.99 -99.99  24.30 
1985 08 99.99 -99.99  24.50 
1985 09 99.99 -99.99  25.80 
1985 10 99.99 -99.99  25.40 
1985 11 99.99 -99.99  26.00 
1985 12 99.99 -99.99  24.20 
1986 01 99.99 -99.99  24.20 
1986 02 99.99 -99.99  27.60 
1986 03 99.99 -99.99  27.10 
1986 04 99.99 -99.99  27.50 
1986 05 99.99 -99.99  24.50 
1986 07 99.99 -99.99  25.10 
1986 08 99.99 -99.99  23.70 
1986 09 99.99 -99.99  24.20 
1986 11 99.99 -99.99  24.10 
1987 02 99.99 -99.99  26.40 
1987 03 99.99 -99.99  27.40 
1987 04 99.99 -99.99  27.50 
1987 06 99.99 -99.99  25.20 
1987 07 99.99 -99.99  25.90 
