1975 05 99.99 -99.99  18.10 
1975 06 99.99 -99.99  20.70 
1975 07 99.99 -99.99  24.30 
1975 08 99.99 -99.99  23.40 
1975 09 99.99 -99.99  23.10 
1975 10 99.99 -99.99  16.90 
1975 11 99.99 -99.99  12.30 
1975 12 99.99 -99.99  10.20 
1976 01 99.99 -99.99   7.80 
1976 02 99.99 -99.99   8.50 
1976 03 99.99 -99.99   8.10 
1976 04 99.99 -99.99  12.70 
1976 05 99.99 -99.99  18.29 
1976 06 99.99 -99.99  21.90 
1976 07 99.99 -99.99  24.50 
1976 08 99.99 -99.99  21.20 
1976 09 99.99 -99.99  19.00 
1976 10 99.99 -99.99  17.50 
1976 11 99.99 -99.99  12.90 
1976 12 99.99 -99.99   8.89 
1977 01 99.99 -99.99   9.50 
1977 02 99.99 -99.99  10.20 
1977 03 99.99 -99.99  12.30 
1977 04 99.99 -99.99  12.70 
1977 05 99.99 -99.99  17.70 
1977 06 99.99 -99.99  21.60 
1977 07 99.99 -99.99  24.20 
1977 09 99.99 -99.99  19.40 
1977 10 99.99 -99.99  17.40 
1977 11 99.99 -99.99  12.60 
1977 12 99.99 -99.99   9.10 
1978 01 99.99 -99.99   8.50 
1978 02 99.99 -99.99   7.90 
1978 03 99.99 -99.99  10.40 
1978 04 99.99 -99.99  12.50 
1978 05 99.99 -99.99  15.90 
1978 06 99.99 -99.99  20.70 
1978 07 99.99 -99.99  23.20 
1978 08 99.99 -99.99  23.10 
1978 09 99.99 -99.99  19.50 
1978 10 99.99 -99.99  16.20 
1978 11 99.99 -99.99  12.00 
1978 12 99.99 -99.99   9.39 
1979 01 99.99 -99.99   6.50 
1979 02 99.99 -99.99   9.00 
1979 03 99.99 -99.99  11.70 
1979 04 99.99 -99.99  12.70 
1979 05 99.99 -99.99  18.29 
1979 06 99.99 -99.99  23.60 
1979 07 99.99 -99.99  22.90 
1979 08 99.99 -99.99  23.00 
1979 09 99.99 -99.99  20.60 
1979 10 99.99 -99.99  16.70 
1979 11 99.99 -99.99  12.40 
1980 07 99.99 -99.99  23.30 
1980 08 99.99 -99.99  24.30 
1980 09 99.99 -99.99  21.00 
1980 10 99.99 -99.99  17.00 
1980 11 99.99 -99.99  11.30 
1980 12 99.99 -99.99   8.00 
1981 01 99.99 -99.99   6.70 
1981 02 99.99 -99.99   7.10 
1981 03 99.99 -99.99  11.50 
1981 04 99.99 -99.99  14.70 
1981 05 99.99 -99.99  17.90 
1981 06 99.99 -99.99  21.80 
1981 07 99.99 -99.99  23.50 
1981 08 99.99 -99.99  23.70 
1981 09 99.99 -99.99  20.60 
1981 10 99.99 -99.99  18.20 
1981 11 99.99 -99.99  11.20 
1981 12 99.99 -99.99   9.10 
1982 01 99.99 -99.99   7.60 
1982 02 99.99 -99.99   7.00 
1982 03 99.99 -99.99   9.50 
1982 04 99.99 -99.99  12.30 
1982 05 99.99 -99.99  17.60 
1982 06 99.99 -99.99  23.00 
1982 07 99.99 -99.99  24.90 
1982 08 99.99 -99.99  24.60 
1982 10 99.99 -99.99  17.70 
1982 11 99.99 -99.99  14.10 
1982 12 99.99 -99.99  10.90 
1987 05 99.99 -99.99  15.60 
1987 07 99.99 -99.99  25.40 
1990 07 99.99 -99.99  24.60 
1991 03 99.99 -99.99  12.50 
1991 04 99.99 -99.99  12.80 
1991 05 99.99 -99.99  15.00 
1991 06 99.99 -99.99  21.90 
1991 07 99.99 -99.99  25.90 
1991 08 99.99 -99.99  25.20 
