Publishers Weekly is reporting the following statistics from the AAP:
e-book sales rose 162.8% in May, to $29.3 million, at the 13 publishers that report results to AAP’s monthly sales report. Sales for the first five months of the year increased 207.4%, to $148.3 million. In some other trade segments, adult hardcover sales jumped 43.2%, to $138.5 million, at the 17 publishers that report results.