It probably helps that of those 11 months in 2007 it was only avalible for 8 of them in the EU.
There is still growth of course but it's incredibly misleading to ignore the missing months. Taking the sales regions individually they have 11*3 months in 2008, 33months. And 11*2+8 for 2007, 30. So right off the bat a 10% difference in the time the console was on sale.
Then again the article doesn't actually mention if the raise is america only or worldwide, so who knows, maybe it's just americas in which case there would be no time difference.







