Playstation Vita vs Wii U 2015 sales

[Dr.Vita]

Alex_The_Hedgehog said:
Gap went from 103.800 to only 34.104 in six weeks.

I think Wii U will be ahead in the end.

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