Check out this site:
http://www.fbi.gov/ucr/ucr.htm
I didn't do an exhaustive analysis, but it seems obvious that most crime nationwide has dropped since 1995. Drug crime is up and down, but pretty much everything else consistantly down.
They only give city specific data for cities over 100,000, so in NH only Manchester. It does seem that in the last 3-4 years some crime has increased there. I hope it's not a statewide trend.