this is a better graph as it shows every week, compared to yours which doesn't show the 8.2m sold by NSMBWii
http://vgchartz.com/swlaunch.php?reg1=All&game1=new+super+mario+bros+-+ds+[1582]®2=All&game2=new+super+mario+bros+wii+-+wii+[35076]®3=All&game3=&weeks=88
this is also an interesting graph. NSMBWii is on pace to beat San Andreas as the fastest selling game to 10m units. If it can sustain 2 more 1m weeks.
http://vgchartz.com/swlaunch.php?reg1=All&game1=new+super+mario+bros+wii+-+wii+[35076]®2=All&game2=Grand+Theft+Auto%3A+San+Andreas+-+PS2[3427]®3=All&game3=Call+of+Duty%3A+Modern+Warfare+2+-+X360[28848]&weeks=88