I think the number 107,000 is the number of janitors and cleaners with degrees, not total janitors and cleaners. Note the author says "Over 317,000 waiters and

I think the number 107,000 is the number of janitors and cleaners with degrees, not total janitors and cleaners. Note the author says "Over 317,000 waiters and waitresses have college degree" - 317,000 is in the same column as the 107,000.