1977 05 99.99 -99.99  25.20 
1977 06 99.99 -99.99  23.90 
1977 07 99.99 -99.99  20.50 
1977 08 99.99 -99.99  22.80 
1977 09 99.99 -99.99  20.00 
1977 10 99.99 -99.99  22.00 
1977 11 99.99 -99.99  25.10 
1977 12 99.99 -99.99  27.00 
1978 01 99.99 -99.99  28.00 
1978 02 99.99 -99.99  26.40 
1978 03 99.99 -99.99  28.30 
1978 04 99.99 -99.99  27.10 
1978 05 99.99 -99.99  27.40 
1978 06 99.99 -99.99  26.50 
1978 07 99.99 -99.99  24.80 
1978 09 99.99 -99.99  24.50 
1978 10 99.99 -99.99  25.90 
1978 11 99.99 -99.99  26.00 
1978 12 99.99 -99.99  27.80 
1979 01 99.99 -99.99  27.40 
1979 02 99.99 -99.99  27.90 
1979 03 99.99 -99.99  27.50 
1979 05 99.99 -99.99  27.10 
1979 06 99.99 -99.99  24.30 
1979 08 99.99 -99.99  22.00 
1979 09 99.99 -99.99  27.60 
1979 12 99.99 -99.99  30.10 
1980 01 99.99 -99.99  31.90 
1980 02 99.99 -99.99  28.50 
1980 03 99.99 -99.99  28.20 
1980 05 99.99 -99.99  27.40 
1980 06 99.99 -99.99  25.60 
1980 08 99.99 -99.99  24.70 
1980 09 99.99 -99.99  24.40 
1980 10 99.99 -99.99  26.00 
1981 01 99.99 -99.99  27.60 
1981 02 99.99 -99.99  28.50 
1981 03 99.99 -99.99  29.10 
1981 04 99.99 -99.99  28.30 
1981 09 99.99 -99.99  26.70 
1981 10 99.99 -99.99  26.80 
1981 12 99.99 -99.99  27.50 
1982 09 99.99 -99.99  27.30 
1984 03 99.99 -99.99  27.00 
1984 09 99.99 -99.99  27.80 
