TWRoO on 04 July 2008
Damn... I worked it out but forgot that the NPD numbers might be USA only.
Anyway nevermind, I could only do it for 2006 vs 2007 anyway because they only had the percentage pie charts for those on the link.... that and the average price becomes skewed by the PS2 selling well in both those years, and the GBA in 2006.
