Ebook sales growth as reported by the IDPF.

The July 2009 report by AAR for May 2009 sales figures shows “E-books sales jumped up by 196.6 percent for the month ($11.5 million), reflecting an increase of 166.7 percent for the year.”
When you compare this to the May 2008 report, when e-books sales saw a 24.3% increase for the month of May and a 31.4% increase for the year, it’s clear that e-book sales are starting to skyrocket.
The rest of the categories reflected:

Adult Hardcover category was down by 40.7 percent in …