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This graph shows the penetration rate of tablet PCs in selected European countries from 2010 to 2016. In 2010, the penetration rate in Spain stood at three percent. Global tablet sales are currently growing at a rapid rate: in the second quarter of 2011, 13.6 million units were shipped, up from 3.3 million in the same period the previous year. Market research firm Gartner expects the growth to continue in the next few years: a recent forecast for tablet sales predicts that 326 million units will be sold in 2015, compared to less than 20 million units in 2010.