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An employee refuels an automobile at a gas station, operated by Rosneft PJSC, in Samara, Russia, on Thursday, Dec. 22, 2016. Oil trimmed a second weekly gain as investors weighed rising U.S. inventories against coming coordinated output cuts by OPEC and other producing nations. Photographer: Andrey Rudakov/Bloomberg via Getty Images

An employee refuels an automobile at a gas station, operated by Rosneft PJSC, in Samara, Russia, on Thursday, Dec. 22, 2016. Oil trimmed a second weekly gain as investors weighed rising U.S. inventories against coming coordinated output cuts by OPEC and other producing nations. Photographer: Andrey Rudakov/Bloomberg via Getty Images