Wii didn't sell 30% better in 2008 though did it? Someone correct me if I'm wrong but it sold 10,151,000 in 2008 and 9,584,000 in 2009, that's about a 5% differece.
thats due to the console shortages in 2008
wii nov2008 2040000
wii dec2008 2150000 <-- !!!! only slightly better than november, it should of done ~5million
check the percentage year on year changes I posted a page or 2 ago, most months wii was ~30% down YOY
famitsu's japan numbers (2008,2009)
wii 2908342 -> 1975178 = 32% less sales
ps3 991303 -> 1727041 = 74% more slaes
xb360 317859 -> 331706 = 4% more sales
gfk france sales (2008,2009)
wii 1600000->1200000 = 25% less sales
ps3 708000 -> 900000 = 27% more sales
xb360 566000 -> 60000= 6% more sales
Im sure it would be a similar story in other countries (except nz of course)