There have been numerous operating system version of Android since the time Google launched Android. According to source, Google detailed the state of Android operating system versions in October 2013 and it has shown that Jelly Bean has passed the 50% adoption rate mark. The three Jelly Bean releases have all gained ground at the expense of the outdated versions as there a good stability and a linking towards the interface and features.
Android 2.3 Gingerbread still powers 26.3% of all Android devices having fallen more than two percentage points since last month and even then it is still the second most popular single version after Android 4.1 Jelly Bean. As for Android 4.0 Ice Cream Sandwich, has lost 0.8% points of it share and has indirectly fallen below the 20% and Android 3.2 Honeycomb is still at the 0.1% threshold.
Android 4.4 KitKat was announced at the very last moment of the survey so it did not make it to the charts so wait for the next report to see the progress of all operating systems which will include Android 4.4 KitKat.