Unfortunately, we don't actually know the impact of Quebec's decision to do that 15 or 20 years ago in any really serious way. There's no real causal linkage, because the research wasn't done when that policy change was implemented. So when we implement policy, we absolutely must have our systems in place so that researchers can come to the table and understand the impact of it.
On June 15th, 2006. See this statement in context.