PS2 2001 sales numbers vs PS3 2008 sales numbers =)

[bigusdickus]

CrazzyMan said:
PS2 May 13th - PS3 May 11th
USA - 74k <> USA - 80k
Japan - 45k <> Japan - 8k
Others - 67k <> Others - 133k
Total - 186k <> Total - 222k
No new releases. Second week of GTA4.
PS2 vs PS3 = -38k

PS2 May 20th - PS3 May 18th
USA - 72k <> USA - 53k
Japan - 27k <> Japan - 7k
Others - 59k <> Others - 104k
Total - 157k <> Total - 165k
Again no new releases.
PS2 vs PS3 = -181k

Crazzyman, how does -38 + 165 - 157 equal -181? Shouldn't it be -30k?