1975 01 99.99 -99.99   7.70 
1975 02 99.99 -99.99   8.10 
1975 03 99.99 -99.99  12.50 
1975 04 99.99 -99.99  18.29 
1975 05 99.99 -99.99  22.90 
1975 06 99.99 -99.99  27.10 
1975 07 99.99 -99.99  27.10 
1975 08 99.99 -99.99  27.10 
1975 09 99.99 -99.99  24.80 
1975 10 99.99 -99.99  20.70 
1975 11 99.99 -99.99  13.50 
1975 12 99.99 -99.99   9.60 
1976 02 99.99 -99.99   8.50 
1976 03 99.99 -99.99  12.20 
1976 04 99.99 -99.99  20.29 
1976 06 99.99 -99.99  27.60 
1976 07 99.99 -99.99  29.60 
1976 08 99.99 -99.99  26.00 
1976 09 99.99 -99.99  25.70 
1976 10 99.99 -99.99  21.30 
1976 11 99.99 -99.99  15.30 
1976 12 99.99 -99.99   9.70 
1977 01 99.99 -99.99   7.00 
1977 02 99.99 -99.99  10.30 
1977 03 99.99 -99.99  17.90 
1977 04 99.99 -99.99  19.29 
1977 06 99.99 -99.99  28.20 
1977 07 99.99 -99.99  29.20 
1977 08 99.99 -99.99  28.70 
1977 09 99.99 -99.99  25.20 
1977 10 99.99 -99.99  20.90 
1977 11 99.99 -99.99  15.60 
1977 12 99.99 -99.99  10.20 
1978 01 99.99 -99.99   6.90 
1978 02 99.99 -99.99   9.70 
1978 03 99.99 -99.99  11.50 
1978 04 99.99 -99.99  20.29 
1978 05 99.99 -99.99  26.80 
1978 07 99.99 -99.99  27.40 
1978 08 99.99 -99.99  27.10 
1978 09 99.99 -99.99  25.40 
1978 10 99.99 -99.99  21.10 
1978 11 99.99 -99.99  13.40 
1978 12 99.99 -99.99  10.90 
