PRNewswire -- The outlook for the restaurant industry was dampened somewhat in May, as the National Restaurant Association’s comprehensive index of restaurant activity registered its first decline in five months. 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 98.3 in May, down 0.3 percent from April and its 19th consecutive month below 100.
