We know the Utada wikipage is full of "mysterious" facts, but I would like to make some sense of this one, in particular. It's about her sales.

In every american interview she made so far, they claim she sold more than 52 million albums. But according to this Sales By Year chart, she only sold 36 million (albums and singles, I'm guessing). And what's even weirder is that most of the radio hosts said they checked her Wikipedia to get the "52 million" stats.

Anyone knows what could explain the difference in numbers?