Uh...why not the proper comparison, which is GDP per kg CO2? While I believe that GDP is Θ(1) bound to CO2 emissions, any comparison should include those constants. Your chart is missing the connection between kWh consumed and GDP generated.
> the connection between kWh consumed and GDP generated
If you don't mind those numbers being normalised by population size, and CO2 emissions being used as a more relevant metric than kWh, then this chart might be helpful: