Android 9 was installed on less than a quarter of the ecosystem as Android 10 launched
Google is announcing that last year’s version of Android, Android 9, accounted for 22.6 percent of the ecosystem as of this past August.
from https://www.theverge.com/2019/10/23/20927371/android-9-pie-google-install-base-percent-vs-iphone-updates-project-treble-mainline
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