Playstation Vita vs Wii U 2015 sales

[Dr.Vita]

Bofferbrauer said:

Dr.Vita said:

VGChartz shows a 180k gap -> http://www.vgchartz.com/yearly/2015/Global/ 
Nobody knows why my gap is only 34k...

Have you rechecked each individual week for updated numbers? You might have missed something there

Checked them already and still doesn't know the problem. 
My guess is that VGChartz has some issues tracking PS Vita.