well I tried. went to wikipedia and a couple other sites, but I'm afraid I couldn't find any actual statistics. The Wikpedia page for Oblivion says something like "3 million" were sold, but it doesn't say if that's only during the first year of sales, or overall sales or what. It doesn't break down sales between T and M versions either, although it
does say something like the T version was only available during 2006. I might be getting that wrong.
Suffice it to say the Teen version definitely seems like it's the less common version, though. What's supposed to be the diff between Teen and Mature versions anyway? The Mature game (which I own) doesn't seem all that mature..it's not like Grand Theft auto or some super-graphic game. Maybe I'm just conditioned to Oblivion's violence, though.