Actual Numbers for X1, PS4 and Wii U after Week Ending 13th Dec

[DJEVOLVE]

Kerotan said:

Nate4Drake said:
PS4 : 16.4M by week-ending Nov 29th, undertracked by VGC by 300k.
17.1M by week-ending Dec the 6th.
18.0M by week-ending Dec the 13th.
19.2M by week-ending Dec the 20th.
20.5M by week-ending Dec the 27th.
20.8M by the end of the Year.

Good guess. I'll go with something similar but my final number between 20M and your number. 

Where are you getting  300,000 undertracked? NPD shows it's overtracked by 200,000. So it's undertracked by 500,000 in europe and other territories?