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«Gdp-energy-efficiency» de Original uploader was Petercorless at en.wikipedia - Transferred from en.wikipedia; transferred to Commons by User:Jalo using CommonsHelper.. Disponible bajo la licencia Dominio público vía Wikimedia Commons - http://commons.wikimedia.org/wiki/File:Gdp-energy-
efficiency.jpg#/media/File:Gdp-energy-efficiency.jpg