1977 03 99.99 -99.99  -3.40 
1977 04 99.99 -99.99   3.00 
1977 05 99.99 -99.99  12.70 
1977 06 99.99 -99.99  12.70 
1977 07 99.99 -99.99  17.40 
1977 08 99.99 -99.99  13.00 
1977 09 99.99 -99.99  10.40 
1977 10 99.99 -99.99   4.40 
1977 11 99.99 -99.99  -1.90 
1977 12 99.99 -99.99 -13.00 
1978 01 99.99 -99.99 -18.79 
1978 02 99.99 -99.99 -17.10 
1978 03 99.99 -99.99 -10.60 
1978 04 99.99 -99.99  -1.00 
1978 05 99.99 -99.99  10.30 
1978 06 99.99 -99.99  12.00 
1978 07 99.99 -99.99  15.80 
1978 08 99.99 -99.99  15.40 
1978 10 99.99 -99.99   3.90 
1978 11 99.99 -99.99  -7.80 
1978 12 99.99 -99.99 -15.90 
1979 01 99.99 -99.99 -19.10 
1979 02 99.99 -99.99 -20.20 
1979 03 99.99 -99.99  -7.60 
1979 04 99.99 -99.99  -1.30 
1979 05 99.99 -99.99   7.10 
1979 06 99.99 -99.99  13.60 
1979 07 99.99 -99.99  16.60 
1979 08 99.99 -99.99  14.30 
1979 09 99.99 -99.99   9.39 
1979 10 99.99 -99.99   1.90 
