Energy/Unit GDP, various countries
The source defines energy intensity, the Y axis, as GDP per 2000 PPP Dollar.
Energy efficiency would appear to be the same thing, except for composition. Energy has to be measured over the complete production channel, as some countries specialize in some portion of production that might be energy intensive, Singapore. So it depends upon if one is talking about a compete economy, which contains most of the stages of production.
The key to having high energy intensity is that you know you can operate with highly regular fuel flows, and your value added is predictable. Singapore, being closed, specialized, and smart can operate a production step with very good energy control.
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