Is gray no data, or zero of x?
Insufficient data to be ranked.
Is gray no data, or zero of x?
Developed resources? Infrastructure? Number of banks? Insurance policy?
I would avoid thinking along the lines of wealth all together. Wealth isn't completely irrelevant but it is very misleading.
It's a social issue.
Teen pregnancy?
Perhaps it's use of birth control.
Getting warmer.
Contraception is part of what is being measured.