NEW YORK - U.S. workers, pushed to produce more and uneasy about new technology and other changes, are markedly less satisfied with their jobs than a decade ago, a new survey says. But the decline in on-the-job happiness, which continued through economic cycles in recent years, has at least temporarily leveled off, according to the survey released Monday by The Conference Board, a New York-based business research group. Half of U.S. workers are happy with their jobs, down from nearly 59 percent in 1995, according to the survey. Of those, just 14 percent say they are very satisfied.