For juvenile fiction, there are 117 million print books sold at brick and mortar stores, or about 3.3 books per student. (indiekidsbooks.com)
Adding its own total to the number of print books sold in 2015, the Bookseller estimates that there were 276.2 m print and digital books sold in 2015, 2.9 % up on its 2014 estimate, with digital accounting for 30.9 % of all volume sales, down from 32.7 %. (goodereader.com)
But I would like to point out one thing, Joanna, and that is that the vast majority of print books sold in the United States, and I'd reckon it's probably the same in the U.K., are offset printed books. (feedspot.com)