Google today updated its monthly numbers for Android version adoption, with Android 4.1.x Jelly Bean saw further rise to 28.4 percent, while Android 4.0 Ice Cream Sandwich taken a fall out to 27.5 percent. Even, Android 2.3.x Gingerbread also dropped further to 38.5 percent, while Android 2.2 Froyo and Android 2.1 Eclair stand at 3.7 percent and 1.7 percent respectively.
The company back last month in April 2013 tweaked on how they now make a count of Android version adoption, here Google explains in its own words: Note: Beginning in April, 2013, these charts are now built using data collected from each device when the user visits the Google Play Store. Previously, the data was collected when the device simply checked-in to Google servers. We believe the new data more accurately reflects those users who are most engaged in the Android and Google Play ecosystem.