It has actually been this way all year outside of the late spring/early summer boost Mario Kart caused (2013 had nothing noteworthy in this time period, hence the YoY increase).
Trimester 1 (pre-Mario Kart)
2013-225k, major releases Lego City (March)
2014-250k, major releases DKC (February)
Trimester 2 (Mario Kart launch)
2013-135k, major releases Pikmin (August)
2014-340k, major releases Mario Kart (May)
Trimester 3 (post Mario Kart, excluding December)
2013 -360k, major releases Wind Waker+3D World
2014-400k, major releases Hyrule Warriors+Smash U
The first & third trimesters of the year are pretty similar with 2014 up by about 10%. The only part of the year with significant growth is when Mario Kart released which happens to be when Wii U had nothing noteworthy in the previous year. If 2013 had a major release in May/June then we likely would have seen only a modest growth YoY like the rest of the year when the release schedules were similar.
When the herd loses its way, the shepard must kill the bull that leads them astray.
