I hate this question. It is crass. It reduces education to a commodity, an economic investment. Pay X today, and increase your earnings power Y over your lifetime. It assumes education is something that benefits individuals, and does not recognize that having an educated populace is a public good. And yet, the question is not irrelevant.
Recently, American University conducted a study of what recent graduates earned their first year after college. They created this online tool that allows you to search future earnings by major. They identify who employs them. It is useful information for any college student.