The above chart could require some explanation. What you have on the Y axis is the percentage of users who are using that version of their operating system. In general, adoption of a new operating system grows, then shrinks after the next OS is released. You can see a perfect (and nearly parabolic) example of that with iOS 4. It rose to nearly 100%, and then started dropping after the release of iOS 5, which has been growing even more rapidly than iOS 4. Their study only caught the drop of iOS 3, as it doesn't go that far back.
The other operating systems on there? Those don't look too clean, and there's a reason for that. Android devices don't see the same update process as iOS. On iOS, when it's updated, all iOS devices that can run the latest OS get it on release day. But for Android, users have to wait for their manufactures to create their own version of the OS. Worse yet, they're motivated to do just the opposite, forcing users to buy the next phone if they want an upgrade.
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