I looked up "per capita murder rates" and located this site ....

http://www.nationmaster.com/graph/c...ders-per-capita

It's interesting that while the US is noted for the violence, they're statistics put us at number 24 in the world. Granted, many of the other countries have other reasons for the killings, but interesting none-the-less. The murders were not listed by particular weapon type or means.