http://en.wikipedia.org/wiki/List_of_countries_by_gun_ownership
http://en.wikipedia.org/wiki/List_of_countries_by_firearm-related_death_rate

And then you should check the stats between counties with low percentage of people carrying and those with a lot in the US.

[Linked Image from w3.the-kgb.com][Linked Image from w3.the-kgb.com]