You could also do a comparison of the 3DS this year to the DS other calendar years too. That's probably a more interesting comparison from here on out, as you compare the same weeks. (As it's obvious the 3DS is going to take a large lead in your current comparison)
For the 3 first weeks of the year, the situation is
DS 2006 | DS 2007 | DS 2008 | DS 2009 | DS 2010 | DS 2011 | 3DS 2012 |
600,000 | 1,105,000 | 1,105,000 | 1,556,000 | 1,635,000 | 884,000 | 1,061,000 |
For the 3rd week ending in the year, the sales were
DS 2006 | DS 2007 | DS 2008 | DS 2009 | DS 2010 | DS 2011 | 3DS 2012 |
170,000 | 310,000 | 366,000 | 349,000 | 321,000 | 207,000 | 246,000 |