Petroleos Mexicanos (Pemex) gas station signs are displayed as attendees speak with vendors during the Onexpo 2015 convention and expo in Mexico city, Mexico on Thursday, June 18, 2015. Petroleos Mexicanos, the world's ninth-largest oil producer, announced last week its biggest oil discovery in five years as the state-owned company seeks to reverse its decade-long decline in production. Photographer: Susana Gonzalez/Bloomberg via Getty Images
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