Nonfarm payrolls rose by a seasonally adjusted 38,000 in May, the weakest performance since September 2010, the Labor Department said Friday . . . Revisions showed employers added a combined 59,000 fewer jobs in April and March than previously estimated. Together, May’s weak job growth and the revisions bring the average monthly job gains in the past three months to 116,000, a sharp slowdown from the average 219,000 growth over the prior 12 months. . . The decline in the unemployment rate was driven by 458,000 people leaving the workforce. The labor-force participation rate fell to 62.6% in May, down 0.2 percentage point from April.