Android 9 was installed on less than a quarter of the ecosystem as Android 10 launched
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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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