EC INDUSTRY OUTPUT GROWTH SLOWS IN 1986 European Community industrial output increased by an average of around two pct last year, compared with 3.3 pct growth recorded in 1985 against a year earlier, the EC statistics office Eurostat said. Growth was highest in Portugal at five pct, while in Greece output contracted by 0.3 pct, Eurostat said in a statement. Eurostat noted output growth also fell in the U.S. And Japan. U.S. Production increased 1.1 pct after 2.0 pct in 1985, while in Japan output contracted by 0.5 pct after rising 4.5 pct a year earlier. Eurostat said EC industrial production in December rose 3.1 pct compared with 12 months earlier but added that after adjustment for seasonal factors, output growth had been clearly slowing down since the beginning of the summe