Current data are more reminiscent of: 60% - 2.2, 27% - 2.1, 1% 2.3 *, 6% 1.6, 5% 1.5
So, with 2.1+ you reach 88% of the market. 3.0 is probably something in the future, but is only available for tablets right now - development exclusively for it will leave all mobile phones for a long time.
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