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The following HTML text is provided to enhance online readability. Many aspects of typography translate only awkwardly to HTML. Please use the page image as the authoritative form to ensure accuracy. 
FIGURE 1.5 Annual per capita energy use (in million Btu per capita) as a function of gross domestic product (GDP) at purchasing-power parity per capita. A progression over time for several representative countries is shown. GDP is a measure of economic activity. On average, higher per capita energy consumption is associated with increasing per capita GDP; however, in some cases, per capita GDP has increased while energy use has declined. Sources: Adapted from Shell International BV, Shell Energy Scenarios to 2050 (2008), based on data from the International Monetary Fund and British Petroleum. 
FIGURE 1.6 Primary U.S. energy consumption, production, imports, and exports, 1949–2007, in quads. Source: Energy Information Administration, 2008b.
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