"As coworkers" just mean "met through work", nothing else. It could also be that a majority of those 11% met in conditions that make is "sane" to date, meaning people who have absolutely nothing to do with one another at work, or one left, was about to leave, or temps (sales reps, contractors, etc).

If nothing else this shows how prevalent work is in life, and how lacking the other general dating options are...

I have a friend who's a nice guy but seems hell-bent on dating at work. I keep telling him not to shit where he eats, so I'm hopeful he'll turn around some day.

The answer is they're going to be adult about it. Even if the breakup gets a bit messy, it's still possible to maintain a good professional relationship. I've got several such ex-couples in my bubble. They're mature enough to make it work.

After seeing how stupid people have been exposed to be over the last several years, I fully believe 11% of the dating world were just that dumb.

Anecdotally there are 4 couples at work in my small division of about 60 people. All longterm employees.