EIA projects declines in U.S. average energy use per person and per dollar of GDP ›
Same website projects a decline in he US average energy use per person.
Again, their are variables as to why. And, mathematically, it should be factored in to be understood and compared, ie education, improving water systems, health improving, less population, more population, longer lifespans, shorter lifespans, more jobs, less jobs, the economy of each country, etc, they are all components to the larger picture. Each component is part of the solution.