I was inspired to come up with this, in light of a discussion on another thread in the Kenpo section about the likelihood of running into a common thug with a martial arts background. And I do apologize if a thread like this already exists. I'm almost positive that no country in the world has a martial arts equivalent to the Department of Education or Bureau of Labor & Statistics that tracks this. We know that, in the US for example, that 30% of adults over 25 have at least a bachelor's degree, 10% have at least a master's degree, and about 2% have a PhD or other research-based doctorate (these are rough numbers, as I haven't looked at the statistics in a while). But what about people who've earned a black belt, or other equivalent rank in martial arts? I've attempted to Google this, and the best I can come up with is martial arts club owners stating that only 1 or 2 percent of students who log their first hour as a white belt will stick around to earn a black belt. But that's just the people who've started in the first place. We need to look at the population at large. Does anyone here have any more in-depth knowledge on this?