To further my last post, this is from The Source's NPD article:
In 2009, hardware sales for the six systems were nearly as strong as in 2008 thanks to December.
DS - 11.21m
Wii - 9.59m
X360 - 4.77m
PS3 - 4.32m
PSP - 2.50m
PS2 - 1.80m
With the massive December, Wii is down less than 6% from its record setting 2008 (10.16m). DS increased 13% from 2008 (9.95m). X360 was just about flat from 2008 (4.74m). PS3 increased by 22% from 2008 levels (3.54m). PSP and PS2 dropped off rather sharply from much stronger 2008 levels - 3.83m (-35%) and 2.50m (-28%) respectively.
So yea obviously was a pretty big year Wii only down 6% after that massive December.