The U.S. economy added 164,000 jobs in April, and the unemployment rate fell to 3.9 percent — the lowest point since 2000, the government’s employment report said Friday. The average hourly wage rose by 2.6 percent year-over-year, maintaining a slow pace of growth, according to forecasts. For the past six months, the jobless rate had clung to 4.1 percent, the longest it has gone without budging since the late 1960s.