According to Association of American Publishers (AAP) sales figures for the first half of 2011, eBook sales were up 160 percent compared to the same period last year.

At the same time, both paperback and hardcover sales have sagged. We’ve embedded the complete chart below–what do you think?

Here’s more from the release: “Adult Paperbacks ranked as the #1 format and e-Books – with an increase of 160.1% vs the first five months of 2010 – ranked #2 in the Trade market for the calendar year to date according to the May 2011 net sales revenue report of the Association of American Publishers, the industry’s national trade association. The popularity of digital publishing formats continued in May with Downloaded Audiobooks also gaining 17.0% year-to-date for calendar year 2011 vs 2010.”