I know the developers have a LOT on their plate, and new categories for World Census measurements are hardly at the top of their list of priorities, but I'd like to share a suggestion for a new statistic that might be interesting/fun:
Poverty Rate: this might make things more interesting because there's no (canon) valuation of a nation's currency, so we don't know for sure just how wealthy a nation's people are in real terms. Not do we know the cost of living, so high incomes and and/or taxes are difficult to interpret in terms of quality of life.
What do you guys think? And what suggestions might you have?