I don't dispute that. But if you institute early child care and you have a bump in participation—and there is historical record now probably in excess of 10 years—you should see a difference between female participation rates in Quebec and female participation rates in the rest of the country.
Evidence of meeting #25 for Status of Women in the 41st Parliament, 2nd Session. (The original version is on Parliament’s site, as are the minutes.) The winning word was gap.
A recording is available from Parliament.