SIRIUS Canada Fastest Growing Satellite Radio Provider in North America?

I was reading through a recent press release by Sirius Canada (found via Get Sirius Info) and an interesting bit jumped out at me:

SIRIUS Canada began broadcasting in December 2005, delivering Canadians an unrivaled radio experience with the most channels, the best variety and the highest quality of coverage among satellite radio providers in Canada. Since its launch, SIRIUS has experienced tremendous growth and is now the fastest growing satellite radio provider in North America.

While SIRIUS Canada is not required to release subscriber numbers, though studies have shown they've gained more marketshare than XM Canada; still using that statement in a press release definitely caught me by surprise. Are we talking SIRIUS + SIRIUS Canada? That might be more believable seeing the incredible growth SIRIUS experienced from Q405. Calculating the rate of growth since launch-time in December could be easily misconstrued as something more than it really is.

Anyway, I'm just being an inquisitive little monkey and found that interesting.