It's American. But probably not too far off from what Canadian retention would look like, with the exception of perhaps Mazda and a few select others.
Canada, by far, is Mazda's largest market in the world, penetration-wise. Huge market share compared to the comparably pitiful sales for Mazdas in the US market. None of the players above average surprise me - Hyundai owners love the value of their car, and they're very high quality now - but I expected Volvo to rank closer to Subaru.
Keep in mind, too, that for repeat purchasers, the brand must have a broad product portfolio. Honda has no pickups... VW no reasonably priced SUVs... but Toyota has more variety than just about anybody - From Echo/Corolla/Matrix/Camry/Avalon to RAV4/Highlander/4Runner/Sequoia, Tacoma/Tundras, Sienna, Celica, Camry Solara, and Prius. I'm sure I'm missing something too!