He writes,

Over the past 25 years the total number of students in college has increased by about 50 percent. But the number of students graduating with degrees in science, technology, engineering and math (the so-called STEM fields) has remained more or less constant. Moreover, many of today’s STEM graduates are foreign born and are taking their knowledge and skills back to their native countries.

…In 2009 the U.S. graduated 89,140 students in the visual and performing arts, more than in computer science, math and chemical engineering combined and more than double the number of visual and performing arts graduates in 1985.

Read the whole thing. I think some of my commenters had already guessed that this was the answer.

On a related note, I did not realize that this was an issue:

on September 1 the Obama administration filed a racial-discrimination complaint against Leprino Foods Co., which makes mozzarella cheese, over its use of WorkKeys assessments to screen job applicants at its plant near Fresno, Calif. According to the complaint, only 49 percent of black, Hispanic, and Asian applicants passed the tests, in contrast to 72 percent of white applicants (a Leprino spokesman declined to comment on the allegations).

It hadn’t occurred to me that A Means A could run into legal issues with disparate impact laws.