I don't know what the breakdown is percentage-wise, but I was just looking at some statistics that are available on the Urban Aboriginal Knowledge Network website, uakn.org.
In some areas—some of the bigger cities like Winnipeg, Edmonton—the percentages for indigenous peoples living in urban settings are anywhere from 8% to 12%, depending on which city you're looking at. With that website I just gave you and the research projects that were undertaken, there's a little snippet at the bottom that tells you the breakdown for each community that they had the research projects in.