The charts are showing only the tests IE9 excel at, which is a fraction of the picture.
The tests also compare IE9 vs current stable releases. I want to see that comparison against beta releases.
Oh wait lets also write down what operating systems IE9 is compatible with:
Google Chrome: Windows XP, Windows Vista, Windows 7, Mac OSX, Linux
Firefox: Windows XP, Windows Vista, Windows 7, Mac OSX, *nix
Opera: Windows XP, Windows Vista, Windows 7, Mac OSX, Linux
IE9: Windows Vista, Windows 7
Oh look IE9 runs on only the latest MS operating system. They don't even support their own older OSes.
Lets not even get into the security aspects.
The latest version of Firefox for OS X requires at least version 10.4 (released 2005). Ditto for Opera.
Google Chrome requires at least 10.5 (released 2007), and doesn't support PPC (the transition to Intel was `completed' in 2007).
Windows Vista went to retail in 2007.
Firefox, Opera and Chrome all still work on Windows XP though.
Meanwhile what fraction is underserved by IE9 not working on Windows XP?
I have no objection to your numbers as long as we also compare apples to apples and quantify the impact.