It's funny because I can't believe that so many people in the north loses their pet birds. If they really are escapes, there should be a lot more around big cities like Montreal or Toronto than deep in the woods. That being said, I understand that our knowledge is based only on what happened in the past, when they use to be very common in pet shops.
http://www.oiseauxqc.org/details.jsp?no=8981.0. On that page you will find 82 mentions of that bird in Qc. Add 2 more for here, one in Belleterre and one in Nédélec last year. You will also see that it's listed as Occasional visitor, with one nesting occurence in Montreal. Maybe they are all escaped birds, but it's hard to believe to me...! Bye