Jabbamk1 on 22 July 2013
YTD sales on this site do not match up with shipments. The Xbox 360 is heavily overtracked on this site.
VGChartz has the 360 on 2.9m SOLD since Jan 2013 (up to 1st July). Microsoft has it on 2.3m SHIPPED since Jan 2013.
I can only imagine the PS3 is being overtracked as well.