I would be really surprised if Harvard got 2,000 or more applications from Canada. Unlike many places in the world, Canada has a more-than-adequate public university system with plenty of capacity to meet demand, at reasonable costs. Most Canadians don’t particularly want to emigrate to the U.S., especially not to someplace cold in the U.S., and Harvard as a brand doesn’t have the same cachet there that it does in Asia. And putting together an application to a selective American university is an enormous PITA compared to applying to top Canadian universities.
By the way, does anyone know how Harvard evaluates student earned income for financial aid purposes? If, for example, there were a family with annual parental income of ~$50,000/year, and the student had a business that earned $20,000/year, would that be treated as a family with $70,000 income, or a family with $50,000 income and a student who was in a position to make a substantial contribution to his education?