From Digital Book World:
Ebook revenues for American publishers selling the digital content abroad are rising — both in aggregate and as a percentage of overall international book publishing revenues.
According to the latest data from the Association of American Publishers, revenues for American Publishers selling ebooks internationally rose 63% to $121.5 million. Meanwhile, international print revenue increased 1.3% to $711.8 million.
Internationally, where Amazon, Apple and Kobo dominate ebook sales in many countries, ebooks now account for 14.5% of all publisher revenues.
Link to the rest at Digital Book World