Colorado Springs is a city of about 470,000, so I'd guess the size of greater Wellington? It has 700 sworn police officers. So on average 1 in 7 cops pulls a gun on somebody in any given month.
Likelihood of firing a weapon is increased by white, male, ex-military, being in a large city, and a few other factors:
Reading the same article...
"In fact, only about a quarter (27%) of all officers say they have ever fired their service weapon while on the job"
This is exceptionally high, higher than I'd have thought.
Nearly 1/3 of cop's have fired at people. Let alone how many drew their guns.
Extrapolating this to NZ, would mean around 3000 cops have fired at people.