Where are you getting those statistics from?
The bolded (six games) were commissioned by Nintendo, funded by Nintendo, and Nintendo staff worked on them to various degrees. I would consider those "first-party games" even if they weren't 100% made by a Nintendo internal studio.
It's more like:
Six games (Nintendo 1st-party)
Two games (3rd-party with some form of Nintendo partnership)
One game (Japanese 3rd-party without any exclusivity deals / partnership)
Five games (Western 3rd-party without any exclusivity deals / partnership)
Tecmo Koei's "Romance of the Three Kingdoms XII" is literally the only announced Japanese third-party game coming this year for the Wii U that isn't the result of some form of Nintendo influence.
nintendo is publishing rayman legends unless something changed.