19. Bruno Mars 8.5% (1.3M albums, 13.5M tracks)
If this list is counting the sales since the beginning of 2011 til now, then bruno has sold more than just 13 million singles, I mean his new songs which were released at 2011 have sold almost 9M so far, lighters has sold more than 2M, also YW&F has sold more than 3M, it will rain is close to 3M, mirror has topped one million, not to forget his other songs, just the way you are sold like 3,2M at 2010 and kept selling throughout 2011, and it's at 5xplatinum (5,274,912), the same is for grenade (5,204,449), and the lazy song (3,241,852).
and I think bruno's album might be at 1,8M according to soundscan, it sold almost 500K at 2010 and I remember that it was certified gold on January 2011