Sony: PS3's global install base is ~30 million, overtracked on VGC?

[parisgaming]

I don't understand anything with numbers: once it's 31M, after 33M AND NOW 30m. If it's true; it could thats 360 underestimed in  many europeens countries! 30M ps3 seems very low, it's almost 7 to 8 millions gap in favour of 360! it seem impossible or that ps3 overtake 360 more slowly than we expected...