Way under tracked in parts of Europe and world, vg cant track it in most markets and their inability to do so is well known. Its a ww seller, to hard for em to track. I haven't played it in a bit and i just got a wheel, to busy with PS4.
With digital its probably in the 5/6m range, It lost about 2m in NA due to no tv commercials but else where it got em, with na being PS3s and Gts weakest market is somewhat makes sense.
a shame there was no PS4 version.