Enrollment is for programs, but course credits are tabulated by subject code (not program). It's possible that students at the university taking foreign languages as actual courses (and not just transferring high school credits) count towards the credit (and revenue) total.

You can see similar things in other programs (look at geography/geology) where'd you might expect a lot of non-major's to take a course in.

EDIT: Or most blatantly, look at math. Pulling in ~20 million dollars of revenue on ~120 program enrollments with an FTE:Enrolled ratio of 3. The credits are clearly from non-major'd students taking courses offered.