This year. Needed an ambulance to get my wife to the hospital for a medical emergency. Fortunately, they released her after only two days.
Last year. A pole transformer a few hundred yards up the street blew up during a rather energetic electrical storm. I hadn't bothered about the first two, I just called the power company's report number to let them know we were in the dark. This one set a couple of trees on fire, though, and left a hot power line swinging around above the street, so I figured it was a bit more urgent.
Year before. Someone lost it on the deadman's curve right before our house (one of the few places in this part of NC I've seen where the "Dangerous Curve Ahead" signs are really warranted) and ended up in our front yard.
Four years ago. At the time we were in an apartment complex in Chapel Hill. A pretty tame one occupied mostly by grad students, young professionals, and retired folks. It was late at night (more like very early in the morning) and I saw several shadowy figures, dressed in black and carrying what looked like rifles, moving around in the periphery of the parking lot lighting.
When I called 911 they told me to keep my line clear, hung up, and called back to tell me it was official business and to stay inside.
Turns out the FBI was moving in on some college kid that had been sending fraudulent emails to a local bank.
They had the wrong apartment, wrong apartment building, and wrong apartment complex.
But on reflection I guess I should have been reassured that I was (mostly) safe, as long as I hadn't gone out to my car to get something or some other suspicious looking activity.
Back through the past few decades. A couple of car accidents which I saw happen. A couple of other medical emergencies which warranted more than loading someone up and driving them to the ER. (Head trauma, possible spinal injury ... that sort of thing.)
On a per year basis? Well under once a year. Or even once every few years.
More, apparently, than some folks here.