Now you're asking me something...
I just knew it, I read this information some months ago. So it's not up-to-date, but much can't be changed.
It was said by the UN, I think. They looked at wealth, school, medical help, ... Important things, IMO.

USA was somewhere between 10 and 20.

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See, we can act as smart as we want, but at the end of the day, we still follow a guy who fucks himself with kebab skewers.