In the past 17 years, Brattleboro police shot and killed two men in the town. During that time in Brattleboro, five other people were killed by people who were not police. So 29 percent of these people were killed by police.
In 2015, the most recent year for which data was available, in the USA there were 15,696 or so murders. That year, police killed 1,186 people in the USA. So 8 percent of these people were killed by police.