The data displays unit sales of printed books in the U.S. from 2013 to 2017, broken down by format. The source reports that mass market paperback sales decreased between 2016 and 2017 by 6.4% and in the last measured period the numbers fell to 55.58 million units sold.
Hardcover | 168250 | 173483 | 178255 | 187940 | 194699 |
Trade paperback | 324701 | 338940 | 355737 | 370019 | 375532 |
Mass market paperback | 80020 | 71758 | 64318 | 59357 | 55577 |
Board books | 23069 | 27092 | 30978 | 33280 | 36878 |
Audio | 5116 | 5128 | 4434 | 3836 | 3327 |