And btw you can not compar, the French charts were a mess before 2011.
The official chart was only about the physical sales.
The DL chart was the "secondary" chart when the sales were actually bigger than the physical ones, if you never released a physical copy of your single but you still had the biggest sales of the week due to DL, you did not chart.
That's why IKAG is still a real #1 in France even tho it did not get the #1 on the official chart but on the DL one.
Who will hold Katy's hand tonight?
Did she work so hard to keep him
Did she try so hard to spite
Was it his cold heart that freed him
From the hold so tight