Traders work on the floor of the New York Stock Exchange (NYSE) in New York, U.S., on Friday, Jan. 8, 2016. The Standard & Poor's 500 Index fluctuated near a three-month low as energy shares followed a retreat in crude, overshadowing early optimism on China's moves to restore calm to its sinking markets and data that showed U.S. payrolls surged more than expected in December. Photographer: Michael Nagle/Bloomberg via Getty Images