I don't have the number in mind, but I can tell you that, since the 2006 Census, we have been asking where people earned their highest degree. So we can determine where they were five years earlier. However, the big challenge for the census is emigration, which we can't get a handle on. Here I'm talking about people who leave the country. When we conduct the census, they are no longer here to tell us that they were in Quebec or Ontario five years earlier.
On April 27th, 2010. See this statement in context.