Wii U sales trend may be just as expected if we look at Nintendo's home console sales.

[Super_Boom]

Max King of the Wild said:

Yeah, a pattern spaced 20 years apart is not enough to be called a trend. Lol.

You act is the data is JUST every 5 years. But the fact remains that the 5 years is comprised of yearly sales, monthly sales, weekly sales and daily sales. Which, obviously if the sell less every 5 years means they sold less yearly during those 5 years too.

OP is only analyzing lifetime data, which was what I was commenting on. 

The problem with analyzing average data (which is what you seem to be implying) is that it asssumes the data to be statistically normal, which drastically simplies the equation, and ignores changes in growth and decline of the individual ranges of data. The OP's argument may very well be valid, but soley presenting individual datapoints is hardly presenting that in a sound way.