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I'm not surprised about Serbia. Having gun at household is part of their national tradition. And there is very little push for gun control despite two back-to-back mass shootings last year.

It's difficult to understand the map. But, how do they get the statistics?

Blank data for UK isn't that surprising. Guns are, for all practical purposes, banned for almost quarter of century, since Blair's government passed such laws following Dunblane massacre.