Google had huge expectations for their Android-based tablets back in 2010, where according to a quarterly Android review presented back in 2010 and uncovered by none other than The Verge, Google expected to sell 10 million Android-based tablets in 2011 which woud equate to a 33-percent stake in the tablet market.
Google expected another 10 million sold in 2012 with a 22-percent market share in 2012. At the time, most would've thought that was reasonable of the company to expect, but Apple have been working quite hard at their tablets and the arse kicking of the market.
How far off the 10 million mark were the Mountain View-based company? Well, they did sell just over 6 million according to Andy Rubin when he spoke at the AsiaD conference in October of last year. Definitely short of their 10 million expectation. Smartphone-wise, Google are triumphantly kicking ass. Tablets, not so much.