“Sales of Apple’s iPad grew from zero to 7.3 million units in 2010 and doubled in 2011 to 15.4 million,” Phillip Elmer-Dewitt reports for Fortune.

“According to our most bullish independent analysts, they doubled again in calendar 2012,” P.E.D. reports. “According to the most bearish professional — Argus Research’s Jim Kelleher — they grew (once you factor out 2011’s extra week) only 3%.”

P.E.D. reports, “The estimates among the 56 analysts we’ve heard from so far — 31 pros and 25 independents — range from Kelleher’s 16.8 million to the indy-high 32 million submitted by the Braeburn Group’s Dennis Hildebrand. The pro’s consensus estimate is 22.8 million; the indies’ is 25.5 million.”

Read more and check out the full list of analysts’ estimates in the full article here.

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