From The Association of American Publishers:
eBook revenues for trade book publishers were up 2.4% in May 2017. The growth was attributed to increased eBook sales for Adult Books, up 3.4% over May 2016. This is the first monthly increase over prior year sales since March 2015, according to the StatShot Monthly report from the Association of American Publishers (AAP).
The increase in eBook sales was one element of a growth month for book publishers. Revenues for book publishers were up by $50.7 million (4.6%) in May 2017 over May 2016. Revenues from Jan. – May 2017 were $4.25 billion, gaining $175.7 million (4.3%) compared to the same timeframe in 2016.
With the exception of Professional Books, all reported categories saw sales increases for the month. The categories with the greatest growth in May were Childrens & Young Adult Books (11.8%) and University Presses (7.3%). With these and other gains, no categories are reporting revenue loss year-to-date.
Link to the rest at The Association of American Publishers