GDP per unit of energy use

nominal U.S. dollar, PPP, per kilogram of oil equivalent, 1990–2015

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PPP GDP is gross domestic product converted to current international dollars using purchasing power parity rates. An international dollar has the same purchasing power over GDP as a U.S. dollar has in the United States. This is expressed in nominal, or not inflation-adjusted, dollars. This measure describes how much GDP was produced per unit of energy expended in doing so.

Source: World Bank