Wii in Japan - Down 577,000 Units For The Year Compared to 2007?

[hanafuda]

Just reading an article from another charting site.  Don't want to ruffle any feathers so won't post the link.  You can find it from n4g.com if you wish.

It says:

'2008 Wii has sold 577,323 fewer consoles in 48 weeks than were sold in 2007.'.

Is this accurate?