Whats the usual increase in sales % during the holidays?

[John_Doe]

DS: 2,019,006
Wii: 1,463,690
PSP: 754,117
PS2: 711,193
PS3: 621,503
360: 592,722

what are your prediction for this years highest week?

DS: 2.2M
Wii: 2M
PSP: 1M
PS3: 0.9M
360: 0.7M
PS2: 0.6M