The outlook for the restaurant industry remained positive in May, as the National Restaurant Association's comprehensive index of restaurant activity held relatively steady. The Association's Restaurant Performance Index (RPI) - a monthly composite index that tracks the health of and outlook for the U.S. restaurant industry - stood at 100.9 in May, down 0.1 percent from its April level of 101.0. Despite the modest downtick, the RPI remained above 100 for the 49th consecutive month, which represents expansion in the Association's composite index of eight key industry indicators.