can show you that the % of government spending ha nothing to do with the wealth of it's citizens or life standards.
You are right the wealth of the population depend on many thing, like productivity, competitiveness, business freedom and capital accumulation in the past. I know the heritage freedom index and i like there work (even if it's not perfect but it's a good indicator).
http://www.heritage.org/index/heatmap
Maybe my question in just relevant is western state where we talk a lot about government spending and debt because it's the major threat to our prosperity.