In an earlier post, I showed the accesses in the first month for the Blue Obelisk and Open Babel papers from late last year.
I should have stopped there.
Instead I decided to see how the recent Avogadro paper compared (Update 15/09/12: thanks to Geoff for filling in the missing points):
BTW, Avogadro 1.1.0 was just released yesterday. Check out the new features.