These numbers are probably low.
There have been many studies of "defensive gun uses" (DGU).
The first was by a criminologist named Gary Kleck, who was anti-gun/pro gun control. He showed on the order of 6MM per year.
Another anti-gun researcher didn't believe Kleck's number, and got a grant from the Department of Justice to do a more thorough/more accurate study (IIRC his name was Jens Ludwig). His supposedly more accurate numbers showed 20MM such uses per year. The hilarious thing about the Ludwig report is that he spent his entire conclusions section trying to prove HIS OWN DATA was wrong.
At one time the Ludwig report was available on-line from the DOJ. I don't know if it still is, as I found it years ago.