1979 11 99.99 -99.99  13.10 
1979 12 99.99 -99.99  13.90 
1980 01 99.99 -99.99  15.10 
1980 02 99.99 -99.99  14.40 
1980 03 99.99 -99.99  13.00 
1980 04 99.99 -99.99  13.50 
1980 05 99.99 -99.99  11.30 
1980 06 99.99 -99.99   8.60 
1980 07 99.99 -99.99   7.50 
1980 08 99.99 -99.99   8.80 
1980 09 99.99 -99.99   9.80 
1980 10 99.99 -99.99  11.40 
1980 11 99.99 -99.99  13.20 
1980 12 99.99 -99.99  16.29 
1981 01 99.99 -99.99  18.79 
1981 03 99.99 -99.99  14.30 
1981 04 99.99 -99.99  12.50 
1981 05 99.99 -99.99   9.80 
1981 06 99.99 -99.99   8.30 
1981 07 99.99 -99.99   7.00 
1981 08 99.99 -99.99   7.70 
1981 09 99.99 -99.99  10.20 
1981 10 99.99 -99.99  11.70 
1981 11 99.99 -99.99  13.30 
1981 12 99.99 -99.99  14.80 
1982 01 99.99 -99.99  16.70 
1982 02 99.99 -99.99  16.20 
1982 03 99.99 -99.99  15.20 
1982 04 99.99 -99.99  11.80 
1982 05 99.99 -99.99  10.00 
1982 06 99.99 -99.99   7.20 
1982 07 99.99 -99.99   5.80 
1982 08 99.99 -99.99   9.50 
1982 09 99.99 -99.99   8.60 
1982 10 99.99 -99.99  10.60 
1982 11 99.99 -99.99  13.50 
1982 12 99.99 -99.99  14.70 
1983 01 99.99 -99.99  13.60 
1983 02 99.99 -99.99  17.79 
1983 03 99.99 -99.99  14.70 
1983 04 99.99 -99.99  11.10 
1983 05 99.99 -99.99  10.20 
1983 06 99.99 -99.99   7.50 
1983 07 99.99 -99.99   7.10 
1983 08 99.99 -99.99   9.60 
1983 09 99.99 -99.99   9.00 
1983 10 99.99 -99.99  11.50 
1983 11 99.99 -99.99  12.80 
1983 12 99.99 -99.99  15.50 
1984 01 99.99 -99.99  15.50 
1984 02 99.99 -99.99  15.10 
1984 03 99.99 -99.99  14.30 
1984 04 99.99 -99.99  11.90 
1984 05 99.99 -99.99  10.10 
1984 06 99.99 -99.99   8.70 
1984 07 99.99 -99.99   7.00 
1984 08 99.99 -99.99   8.20 
1984 09 99.99 -99.99   8.70 
1984 10 99.99 -99.99  11.20 
1984 11 99.99 -99.99  14.00 
1984 12 99.99 -99.99  13.60 
1985 01 99.99 -99.99  14.60 
1985 02 99.99 -99.99  14.30 
1985 03 99.99 -99.99  16.29 
1985 04 99.99 -99.99  14.10 
1985 05 99.99 -99.99  10.60 
1985 06 99.99 -99.99   7.00 
1985 07 99.99 -99.99   7.10 
1985 08 99.99 -99.99   8.80 
1985 09 99.99 -99.99   9.60 
1985 10 99.99 -99.99  12.40 
1985 11 99.99 -99.99  14.10 
1985 12 99.99 -99.99  16.10 
1986 01 99.99 -99.99  14.90 
1986 02 99.99 -99.99  14.70 
1986 03 99.99 -99.99  15.50 
1986 04 99.99 -99.99  12.00 
1986 05 99.99 -99.99  10.20 
1986 06 99.99 -99.99   7.10 
1986 09 99.99 -99.99   9.50 
1990 10 99.99 -99.99  12.00 
1990 11 99.99 -99.99  13.40 
1990 12 99.99 -99.99  14.40 
1991 01 99.99 -99.99  16.20 
1991 02 99.99 -99.99  14.10 
1991 03 99.99 -99.99  13.00 
1991 04 99.99 -99.99  11.10 
1991 05 99.99 -99.99   9.80 
1991 06 99.99 -99.99   8.89 
1991 07 99.99 -99.99   8.20 
1991 08 99.99 -99.99   7.40 
1991 09 99.99 -99.99   8.70 
1991 10 99.99 -99.99  11.10 
1991 11 99.99 -99.99  12.00 
1991 12 99.99 -99.99  14.90 
1992 01 99.99 -99.99  14.00 
1992 02 99.99 -99.99  15.60 
1992 03 99.99 -99.99  14.90 
1992 04 99.99 -99.99  12.30 
1992 05 99.99 -99.99  10.10 
1992 06 99.99 -99.99   6.40 
1992 07 99.99 -99.99   7.60 
1992 08 99.99 -99.99   7.10 
1992 09 99.99 -99.99   7.80 
1992 10 99.99 -99.99  11.60 
1994 11 15.99 -99.99 -99.99 
1994 12 22.96   8.04  15.50 
1995 02 22.52   9.76  16.14 
1995 05 12.91   4.38   8.64 
