I think a serious mental illness, a psychosis, in the general population is 1% to 3%. Depression is much broader.
The figures generally are that one in five people in Canada will have a mental illness or substance abuse problem in their lifetime. That's a fairly well-accepted figure. In Ontario, I believe it's one in four.
It's somewhere between 3% and 20%. We're probably not the ones in a position to help you with the criteria for the way the Correctional Service is deciding who has a serious mental illness. The 12% to 20% is what I've heard the correctional officials give you.