Secondhand, 2. (i.e. I know 2 people who this has happened to, but I was not there at the time). One shot himself trying to pull his weapon in a altercation by a mugger while with his wife in a parking lot. Fortunately, when the weapon went off, the bad guy fled...He ended up almost dying.
Look on youtube for gun “Experts” like instructors lecturing with their guns shooting themselves in the foot, leg, etc. It happens!
The answer is "zero".
Pretty much what I expected.
Thank you for your prompt and honest reply.