The U.S. labor market added 216,000 jobs in December. That’s much more than the 170,000 expected by economists surveyed by Dow Jones, and the downwardly revised 173,000 jobs added in November. The unemployment rate held steady at 3.7%, defying estimates of a 10-basis-point rise. Meanwhile, average hourly earnings rose 4.1% from a year earlier, higher than the 3.9% forecast.