Pretty self explanatory but here are the numbers according to vgchartz
Wii U
2012-2.25 million
2013-3.15 million
2014-3.65 million
2015-3.45 million
2016-1.55 million
Switch
2017-3.50 million as of April 29.
Adding in May numbers easily puts Switch over any year for Wii U.
When the herd loses its way, the shepard must kill the bull that leads them astray.