From Publishers Weekly:
Sales of adult books dropped 9.8% in July, compared to the same period in 2016, while sales in the children’s/young adult segment fell 36.8%. The statistics are derived from figures released by the Association of American Publishers as part of its StatShot program.
The plunge in children’s/ya sales was due to the release last July of Harry Potter and the Cursed Child, which was a huge hit in 2016. The publication of Potter had the greatest impact on the children’s/ya hardcover format, where sales fell 61.1% in July compared to a year ago. E-book sales were down 16.0%.
. . . .
In the adult books segment, mass market paperback and physical audio saw declines of 26.3% and 41.7%, respectively.
Link to the rest at Publishers Weekly