Wii Fit numbers. Any word on this yet? Related to Cammies 15M sold comment.

[Euphoria14]

Fast forward to 12:50 of the Nintendo conference. Cammie states that Wii Fit has sold 15M units worldwide since it's launch 13 months ago. VGChartz has it listed at 19.54M.

Now 15M sold = 15M shipped if I am not mistaken. So shouldn't our numbers be somewhere around 14M+?

Was this an error on Cammie's part or are our numbers wrong?

http://e3.gamespot.com/press-conference/nintendo-e3/

I am not trying to discredit the site but I am confused about the 4.54M+ difference here.

 

Thanks in advance.