1977 01 99.99 -99.99   4.40 
1977 02 99.99 -99.99  12.00 
1977 03 99.99 -99.99  20.80 
1977 04 99.99 -99.99  23.60 
1977 05 99.99 -99.99  30.50 
1977 06 99.99 -99.99  36.20 
1977 08 99.99 -99.99  34.20 
1977 09 99.99 -99.99  26.20 
1977 10 99.99 -99.99  23.10 
1978 01 99.99 -99.99   6.20 
1978 02 99.99 -99.99  10.00 
1978 03 99.99 -99.99  14.20 
1978 04 99.99 -99.99  25.00 
1978 05 99.99 -99.99  28.10 
1978 06 99.99 -99.99  32.70 
1978 07 99.99 -99.99  35.20 
1978 08 99.99 -99.99  32.30 
1978 09 99.99 -99.99  28.30 
1978 10 99.99 -99.99  21.20 
1978 11 99.99 -99.99  11.10 
1978 12 99.99 -99.99  10.40 
1979 01 99.99 -99.99   8.10 
1979 02 99.99 -99.99  11.10 
1979 03 99.99 -99.99  14.50 
1979 04 99.99 -99.99  24.20 
1979 05 99.99 -99.99  25.60 
1979 06 99.99 -99.99  32.59 
1979 07 99.99 -99.99  35.20 
1979 08 99.99 -99.99  31.70 
1979 09 99.99 -99.99  28.30 
1979 10 99.99 -99.99  23.30 
1979 11 99.99 -99.99  12.20 
1979 12 99.99 -99.99   9.30 
1980 01 99.99 -99.99   9.30 
1980 02 99.99 -99.99  12.00 
1982 01 99.99 -99.99   8.89 
1982 02 99.99 -99.99  12.50 
1982 03 99.99 -99.99  15.00 
1982 04 99.99 -99.99  23.30 
1982 05 99.99 -99.99  27.20 
1982 07 99.99 -99.99  35.00 
1982 08 99.99 -99.99  31.10 
1982 09 99.99 -99.99  27.10 
1982 10 99.99 -99.99  22.30 
1982 11 99.99 -99.99  12.50 
1982 12 99.99 -99.99   7.50 
1983 01 99.99 -99.99   7.10 
1983 02 99.99 -99.99  10.70 
1983 03 99.99 -99.99  12.40 
1988 02 99.99 -99.99  10.40 
1989 03 99.99 -99.99  18.20 
1990 06 99.99 -99.99  36.80 
1990 07 99.99 -99.99  37.90 
1990 08 99.99 -99.99  33.50 
