No, we haven't done that. What is really required there is to have either longitudinal data, where you could track people over time, or retrospective data, where people reflect on their lives.
Marie Drolet, one of our analysts, looked at the length of time during the working life and what the difference in years of participation was for women. She has quantified that. If I recall correctly, I think it's in the order of four to five years less than their male counterparts, which would have implications on contributions.
On that point, obviously there are provisions within the Canada and Quebec pension plans for dropouts for a period of time. I think where an interesting issue resides is with group RRSPs or defined contribution plans: what are the implications for periods out of the labour force for women under those types of retirement savings arrangements? There, we don't know very much.