Yes that is exactly what I am looking for. All the charts favoring Android compare an operating system to a cell phone.
Do you have any links? I don't recall charts such as you describe. The charts I've seen either compare phone sales, tablet sales, or total OS market share... but never mixed together.
For example, Comscore's charts show that currently, about 47% of US
smartphone owners use Android, 30% use iOS:
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Comparing OSes worldwide, at the beginning of 2012 there had been 316 million iOS devices sold since 2007. At the same time, Google announced 300 million Android activations since 2008. (That does NOT include the millions of Nooks and other non-Google-app licensed devices in the world.)
At the current rate of Android activations (850K a day) and iOS activations (guessed by analysts at 350K-500K a day), Android's official count should pass iOS pretty soon.
Totals starting a half decade ago don't mean much right now, though. After all, Palm total sales over years were higher than iPhone sales for a long time. To developers, I'd say what counts is how many are currently being used.
To a user, what should count is if a device fits your needs and desires.