[Wrana]

I think that just what nations HAVE been chosen isn't a full indicator of popularity. While I can't think offhand of how to rate which nations were chosen first, while others were taken only as 2nd/3rd pick, it would be probably good to include.
Also, I can attest that TucoTuco, e.g., was initially started with no water nations. It's possible that a possibility of such starts itself speaks for something - maybe about weakness of Oceania, as was said. But it surely subtracts from their popularity index...