That's a good question. Although I'm not familiar with the whole list, the big ones being taught at the University of Ottawa are Cree, Ojibwa, and Inuktitut. Year by year, it depends on which individuals are available to teach those languages and also where the various groups are interested in having the languages taught. Sometimes they will bring people to the community, or sometimes they will come to the campus.
It depends on the year. I don't think it's clearly established yet, but at the moment, it tends to be the languages that have the most speakers.