US data was 2010,
It actually looks like 2008 according the FBI site. The only reason I'm pointing this out is because the rate for Vermont looked abnormally high to me, which it was in 2008. They've only had a homicide rate that high in 3 of the last 25 years.
Not all murders are done with guns of course; 2010 stats for the firearm ones at :
Gun crime statistics by US state: download the data. Visualised | World news | guardian.co.uk
Notice for 2010 that Vermont had 1 total, giving them the lowest rate at .32