Worldwide digital books market will grow at an average rate of 30 percent per year between 2010 and 2015 to reach EUR 5.4 billion in 2015, or 12 percent of the total book market, according to a report by Idate. E-Book readers will also develop from 3.3 million units sold in 2010 to 29.8 million units sold in 2015, representing a 24 percent growth rate per year. North America will see an average annual growth rate of 13 percent between 2012 and 2015. At that time, sales of e-books are expected to generate a turnover of around EUR 2.2 billion. The five major European countries will experience higher growth on the same period, to reach in 2015 an overall turnover of about EUR 1.4 billion for an average annual growth rate of 30 percent over the period.