nordlead on 16 October 2008
I think this is a better graph
http://www.vgchartz.com/swlaunch.php?reg1=All&game1=Wii+Fit+-+Wii®2=All&game2=®3=All&game3=&weeks=55&weekly=1
It shows that sales have been growing over time ever since it launched in all 3 regions.