Although staggering under a $123.3-billion deficit with foreign partners as a whole, the U.S. economy increased its trade surplus with Communist nations last year. Figures compiled by the International Trade Commission and the Commerce Department show that two-way trade between the United States and Communist countries increased more than 43% from 1983 to 1984. By contrast, trade with those countries had declined nearly 12% in the previous year. The U.S. surplus went from $1.1 billion in 1983 to $1.5 billion last year. Trade with China and the Soviet Union accounted for more than 80% of the total with Communist nations.