Comes from OpenSignal which has updated its last years amazing report on Android device fragmentation. This year they generously shared their source data as well. Wonderful people. See report at :
http://opensignal.com/reports/fragmentation-2013/
and see their latest blog post strategies to cope with the fragmentation at :
http://opensignal.com/blog/2013/07/30/40-developer-tips-for-android-optimization/