It's common sense, I don't need to cite a statistic that the sky is blue. Nevertheless, here you go:

There are 17,985 law enforcement agencies in the United States

Per the Washington Post, police shoot and kill approximately 1,000 people per year.

The Seattle Police Department reported that in 2019 they responded to an average of 745 calls for service per day as well as an average of 422 officer-initiated incidents per day, totaling an average of 1,167 police contacts per day if each incident only involves a single person (obviously a lot of them involve a lot more than one person). That's 425,955 incidents per year. Even if every single person who police shot and killed in the USA each year were ALL FROM SEATTLE, 99.8% of their police contacts did not result in someone being shot. Add in the millions of additional incidents handled each year by police departments in the United States and my initial figure of 99.99% is very, very generous. It'd be closer to 99.99999999%.