Apple surely loves its third-party app developers, but it doesn't love them equally. The company reserves special affection for those who optimize their apps for the latest version of iOS and its integrated services (Passbook, Game Center, Maps etc.), and we guess that's why the official iOS Dev Center has published the chart above. Based on two weeks' worth of recent data, it shows that 93 percent of iOS users who visited the App Store were on iOS 6, while just one in a hundred were on something lower than iOS 5, implying that fragmentation isn't something for devs to fret over. Of course, as Appleinsider points out, Cupertino may have had other reasons for choosing this specific style of presentation, since it begs to be compared against Android's fortnightly pie chart (shown below).
Source: iOS Dev Center