U.S. nonfarm productivity fell at its fastest pace in a year in the first quarter as harsh winter weather restrained output, leading to a jump in labor-related production costs, Reuters reported. Productivity declined at a 1.7 percent annual rate, the biggest drop since the first quarter of 2013, the Labor Department said on Wednesday. The drop in productivity, which mirrored a sharp decline in economic growth, is temporary, and Federal Reserve officials are likely to shrug off the spike in labor costs, analysts said. Productivity, which measures hourly output per worker, advanced at a 2.3 percent pace in the fourth quarter; economists had expected it to decrease at a rate of only 1 percent in the first three months of the year.