Top 10 Biggest Job Markets for Teaching English Abroad

What are the biggest job markets for teaching English abroad?

With more than a billion and a half people taking some form of English course each year in nearly every country on earth, the world is in a sense one big job market for qualified English teachers.  Realistically, a native English speaker with a college degree and an accredited TEFL certification can teach English abroad professionally in 80 countries or more and even those without a degree who do get TEFL certified can teach in up to 50 countries.  That said, certain countries have higher demand and offer more opportunities than others.