I can speak to a bit of it. We don't have the exact numbers, but we did some estimates based on 2016 approvals. We modelled what the impact of the October 2016 changes would have been on our books and the decline in it by about 37% nationally in the number of approved high-ratio mortgages. That's what we were estimating. It depends on which region you are in. It could be higher in the Lower Mainland of B.C., and of course, in Toronto and in Alberta, somewhat higher than that.
Evidence of meeting #67 for Finance in the 42nd Parliament, 1st Session. (The original version is on Parliament’s site, as are the minutes.) The winning word was mortgages.
A video is available from Parliament.