1975 05 99.99 -99.99  18.60 
1975 06 99.99 -99.99  21.30 
1975 07 99.99 -99.99  24.40 
1975 08 99.99 -99.99  24.00 
1975 09 99.99 -99.99  22.90 
1975 10 99.99 -99.99  16.29 
1975 11 99.99 -99.99  10.80 
1975 12 99.99 -99.99   9.10 
1976 01 99.99 -99.99   6.90 
1976 02 99.99 -99.99   8.39 
1976 03 99.99 -99.99   7.80 
1976 04 99.99 -99.99  12.50 
1976 05 99.99 -99.99  18.00 
1976 06 99.99 -99.99  21.80 
1976 07 99.99 -99.99  24.40 
1976 08 99.99 -99.99  21.00 
1976 09 99.99 -99.99  18.60 
1976 10 99.99 -99.99  17.70 
1976 11 99.99 -99.99  12.40 
1976 12 99.99 -99.99   8.20 
1977 01 99.99 -99.99   9.20 
1977 03 99.99 -99.99  12.60 
1977 04 99.99 -99.99  12.90 
1977 05 99.99 -99.99  18.40 
1977 06 99.99 -99.99  21.60 
1977 07 99.99 -99.99  24.20 
1977 09 99.99 -99.99  18.90 
1977 10 99.99 -99.99  16.90 
1977 11 99.99 -99.99  11.60 
1977 12 99.99 -99.99   7.50 
1978 01 99.99 -99.99   7.60 
1978 02 99.99 -99.99   7.90 
1978 03 99.99 -99.99  10.10 
1978 04 99.99 -99.99  12.60 
1978 05 99.99 -99.99  16.40 
1978 06 99.99 -99.99  20.80 
1978 07 99.99 -99.99  23.40 
1978 08 99.99 -99.99  22.90 
1978 09 99.99 -99.99  18.79 
1978 10 99.99 -99.99  16.40 
1978 11 99.99 -99.99  10.90 
1978 12 99.99 -99.99   9.30 
1979 01 99.99 -99.99   5.80 
1979 02 99.99 -99.99   8.60 
1979 03 99.99 -99.99  11.70 
1979 04 99.99 -99.99  12.10 
1979 05 99.99 -99.99  18.90 
1979 06 99.99 -99.99  23.60 
1979 07 99.99 -99.99  23.30 
1979 08 99.99 -99.99  23.40 
1979 09 99.99 -99.99  20.60 
1979 10 99.99 -99.99  16.40 
1979 11 99.99 -99.99  11.70 
1979 12 99.99 -99.99  10.50 
1980 01 99.99 -99.99   6.00 
1980 02 99.99 -99.99   8.70 
1980 03 99.99 -99.99   9.60 
1980 04 99.99 -99.99  10.90 
1980 05 99.99 -99.99  15.90 
1980 06 99.99 -99.99  20.40 
1980 07 99.99 -99.99  23.60 
1980 08 99.99 -99.99  24.90 
1980 09 99.99 -99.99  21.10 
1980 10 99.99 -99.99  16.90 
1980 11 99.99 -99.99  11.30 
1980 12 99.99 -99.99   6.90 
1981 01 99.99 -99.99   4.40 
1981 02 99.99 -99.99   6.60 
1981 03 99.99 -99.99  11.90 
1981 04 99.99 -99.99  14.50 
1981 05 99.99 -99.99  17.70 
1981 06 99.99 -99.99  22.00 
1981 07 99.99 -99.99  23.30 
1981 08 99.99 -99.99  24.10 
1981 09 99.99 -99.99  21.00 
1981 10 99.99 -99.99  17.79 
1981 11 99.99 -99.99   9.30 
1981 12 99.99 -99.99   8.20 
1982 01 99.99 -99.99   6.60 
1982 03 99.99 -99.99   9.39 
1982 04 99.99 -99.99  12.60 
1982 05 99.99 -99.99  18.90 
1982 06 99.99 -99.99  23.90 
1982 07 99.99 -99.99  25.30 
1982 08 99.99 -99.99  24.70 
1982 09 99.99 -99.99  23.40 
1982 10 99.99 -99.99  17.50 
1982 12 99.99 -99.99   9.70 
1987 05 99.99 -99.99  15.90 
1987 07 99.99 -99.99  26.30 
1991 04 99.99 -99.99  13.00 
1991 05 99.99 -99.99  15.20 
