Same year I deleted all our customer's websites by simply dragging the hosting folder somewhere into C:\programs or something by mistake... A double click + lag turned into a drag and drop! Whoops!
I was pale as a ghost as I asked for the zip drive.
We had to reboot the file server first, which we did a swift kick to the power button.
At least today we employ very secure mechanisms; like YAML rollouts of config, to keep things interesting.
Google still uses a clone of Perforce internally (and various wrappers of it). Perforce was released in 1995.
For code, I prefer git as I said, but in a game's depot most files are not code, and Perforce is built around handling those other assets well.
But the percentage is probably small, yes.