In the county I'm from? Roughly 50,000 a year. Though the vast majority of those are sprains, concussions, and other fall related injuries. Lacerations are rarer.

[Yes, David absolutely had done that research and knew the numbers. Listen, he was really invested in the ice when he was younger.]

There are also some injuries and the like that derive from people skating outside of rinks in dangerous conditions, but that's something else.