Charts are pretty self explanatory. Total energy consumption of nations/groupings of nations vs. their core (25-54yr/old) employed populations and total core (25-54yr/old) populations. By the way, I think the change in energy consumption is a pretty good tell for actual economic activity and growth.
Below, total US energy consumption (quadrillion BTUs) vs. core employees. Correlation? Causation? Anyway, just is what it is.
Below, same as above but added core population through 2025 (UN assumes, perhaps wrongly, continued levels of immigration to achieve that slight population growth).