Taking a look at these numbers, the NES saw 72 games released in the United States by Nintendo, with a further 590 games coming from third parties. The SNES breakdown was 52/667, the N64 was 53/244, the GameCube had 48/504 and the Wii a staggering 55/1206.
Now to the Wii U. To date Nintendo has released 39 games in the US, while third parties have released just 118. It's important to note that the Wii U figure doesn't include games (like indie titles) that were only released digitally.