Not sure how significant this is but it's here's an interesting graphic from Christopher Ingraham at the Washington Post.
Go to the original source to see an interactive version Wonder how one would count a combination gun shop - gun museum?
Don't forget - you can find a lot of knowledge on the Internet, and all of it is true!
For some reason this graphic reminds me of Warren Zevon's Lawyers, Guns and Money.
"Ideas are more powerful than guns. We would not let our enemies have guns, so why should we let them have ideas?" - Joseph Stalin