Traders work as Janet Yellen, chair of the U.S. Federal Reserve, is seen speaking on a television screen on the floor of the New York Stock Exchange (NYSE) in New York, U.S., on Wednesday, Dec. 16, 2015. The Federal Reserve raised interest rates for the first time in almost a decade in a widely telegraphed move while signaling that the pace of subsequent increases will be "gradual" and in line with previous projections. Photographer: Michael Nagle/Bloomberg via Getty Images
