EDIT: Ninja'd
That can't be it, because the UK and France are the same color, but the UK abstained while France voted for it.
Looks a lot like the map for who voted in favour of Palestine yesterday at the UN…
That can't be it, because the UK and France are the same color, but the UK abstained while France voted for it.

Nothing so far. I don't want to give a confusing hint, but maybe I can say that there may be discussion on how to measure this correctly, i.e. it's not something that's easily countable.