From Publishers Weekly:
A slump in the second half of 2017 led a decline in bookstore sales in 2017 compared to 2016. According to preliminary estimates released Wednesday morning by the U.S. Census Bureau, bookstore sales dropped 3.6% last year compared to 2016. Sales in 2017 were $10.73 billion, down from $11.14 billion in 2016.
After rising in the first part of 2017 over 2016, bookstore sales ended 2017 on a five-month losing streak, capped by a very soft December. Sales in the last month of 2017 were $1.18 billion compared to $1.29 billion in December 2016. The weak end to 2017 mirrors to some degree the experience of Barnes & Noble which reported a 6.4% decline in sales in the nine week period ended December 31, 2107 compared to the same period a year ago.
Link to the rest at Publishers Weekly