In 2002,the five leading mechanisms of injury death accounted for 81% of all 161629 injury deaths: motor-vehicle traffic (MVT) (27%), firearm (19%), and poisoning (16%),descend (11%), and suffocation (8%). All MVT-related and nearly all descend deaths were classified as unintentional. Of the firearm deaths, or 57% were suicides,and 39% were homicides. Two thirds of poisonings were unintentional. Half of suffocations were suicides, and 43% were unintentional.
Source: cdc.gov