|U.S. Book Sales Statistics compiled by the Association of American Publishers|
The AAP's official figures put ebook sales at 8.32 percent of the domestic trade book market, up from 3.2 percent in 2009. As you can see from the chart above (released as part of this morning's press report), sales of printed books have now declined for three years running, while ebooks gained significant ground during the same period, and have done so consistently since the AAP began tracking digital sales in 2002.
And that's a trend that's not likely to change anytime soon.
With the single exception of a large jump in 2005, print book sales have remained essentially stagnant for over a decade now. And with the cost of print editions climbing as sales fall (a self-perpetuating cycle), and retail outlets being eliminated right and left at an alarming rate, digital editions will only continue to claim more and more of the overall book market.