I recently showed my students a graph from Pew poll of Americans in general on this topic. Let's see if I can find that again...

"While Americans value college, they value character even more. Asked what it takes for a young person to succeed in the world, 61% say a good work ethic is extremely important and 57% say the same about knowing how to get along with people. Just 42% say the same about a college education."

Seems like 43% cited on-the-job training.