米出版社協会 (The Association of American Publishers = AAP) が7日に発表したデータによると、2009年の電子書籍の販売額は3億1300万ドル(約290億円)で、書籍全体に占める割合は1.3%だった。 AAP Reports Book Sales Estimated at $23.9 Billion in 2009 http://www.publishers.org/main/PressCenter/Archicves/2010_April/BookSalesEstimatedat23.9Billionin2009.htm ...U.S. publishers had net sales of $23.9 billion in 2009, down from $24.3 billion in 2008, representing a 1.8%