If you look at the performance on the part one exam--and they have to have passed the evaluating examination to have done that--about 90% to 95% of Canadian graduates will pass, and it's somewhere in the neighbourhood of about 65% to 70% for IMGs if they pass part one the first time. It drops down to about 50% to 60% if they've taken more than one opportunity to take the exam.
On April 1st, 2010. See this statement in context.