The first full shopping week after Christmas, which ran from December 29, 2019, through January 4, 2020, saw unit sales of print books fall 3.7% compared to the similar week in 2010 at outlets that report to NPD BookScan.
Only one of the major categories posted an increase in the week. Sales in adult fiction inched ahead 1% over the week ended January 5, 2019, as Where the Crawdads Sing continued to be a strong performer, selling more than 31,000 copies in the week. One new release that cracked the top five sellers in adult fiction was Such a Fun Age by Kiley Reid, which sold nearly 11,000 copies in its first week on sale.
Sales in adult nonfiction fell 2.6% compared to 2019 despite a solid showing from The Defined Dish by Alex Snodgrass, which sold nearly 32,000 copies, making it #1 on the adult nonfiction list.
more at source: https://www.publishersweekly.com/pw/by-topic/industry-news/financial-reporting/article/82146-print-unit-sales-dropped-3-7-after-christmas.html