Google has now released its latest Android distribution figures for the period to the 4th of September 2013. Android 4.3 Jelly Bean is now on a total of 45 percent of all Android devices.
In second place is Android Gingerbread, which is is on 30.7 percent of Android smartphone and tablets, and in third place is Android Ice Cream Sandwich which accounts for 21.7 percent of devices.
Finally we have Android 2.2 Froyo with a 2.4 percent share and Android Honeycomb with just a 0.1 percent share, Google also posted the following note about older versions of Android which will no longer appear in the monthly report.
Because this data is gathered from the new Google Play Store app, which supports Android 2.2 and above, devices running older versions are not included. However, in August, 2013, versions older than Android 2.2 accounted for about 1% of devices that checked in to Google servers (not those that actually visited Google Play Store).
Source Android Developers