The National Fire Protection Association shows a similar trend, but the numbers don't always match.
Why we need to take the 'fire' out of 'fire departments'. (Governing, 7/1/2015)
Plenty of firefighters, but where are the fires? (Boston Globe, 9/8/2013)
Non sequitor time: Ron Johnson skips Cap Times Idea Fest, smears Christine Blasey Ford. (9/30/2018)