I could not tell you. I imagine that you are referring to studies from the Conseil supérieur de la langue française du Québec. Perhaps there are studies going on. I know that the issue of people of francophone lineage who leave the Island of Montreal to settle on the south shore or on Laval island is frequently raised. This is no doubt actually reflected in the figures, but I cannot make any further comments.
On January 29th, 2008. See this statement in context.