My daughter's class in high school had three deaths her senior year -- cancer, undetected heart problem, car crash. She had to miss one of the memorial services because of volleyball. She quit volleyball after that.
I didn't remember anyone dying my senior year (1970). Unless they were close friends, you just never heard about it. I asked some of my classmates and, yes, there were a couple from auto crashes. Our school enrollment was around 3,000 (3-year school) so about 1,000 in my class.
I was working on our Valhalla or "Into the Light" list before my last reunion 3 years ago. Came up with about 85 names of deceased classmates. I have no idea what a more precise number might be. I can only guess that it might be double or triple that. There are so many who don't keep in touch, moved away and never looked back, those who didn't like high school. It is so sad when you find out about a classmate's death. It's more frequent now since we've passed the age 70 milestone.