From Publishers Weekly:
In today’s release (December 13, 2021) of its United States print books weekly media report for the week ending December 4, Kristen McLean, executive director and industry analyst with NPD Books and Entertainment, shows the American publishing industry pressing into the holiday run with the strength that has distinguished it and several other world book markets in the second year of the coronavirus COVID-19 pandemic.
McLean writes, “2021 and 2020 are converging as we reach the end of the year.
“This past week was essentially flat” in comparison to the same week in 2020, she reports, “crossing the 25-million-unit mark about a week earlier than the seasonal norms set in 2019 and 2018, and two weeks earlier than 2017.
“The market finished the week up 10 percent on a year-to-date volume of 726 million units, which is 67 million units ahead of 2020, and 118 million units ahead of 2019.
“If we finish the year as we project at 8 percent higher, year-over-year, on a unit basis, that will be 17 percent higher than 2019, a finish none of us would have foreseen on January 1, 2020.”
And this time, McLean has included what NPD Group calls its “Total Market Retail Thermometer” (from its “Retail Center of Excellence” material), to get a look at the sales revenue performance of all other non-book retail that NPD tracks as a percentage of 2019 performance.
“2021 has already exceeded 2019 by 4 percent,” McLean announces, “with four more holiday weeks to go.”
Link to the rest at Publishers Weekly
The headline of the OP caught PG’s attention because he suspected 2019 was a typo.
PG will note that NPD’s data “covers approximately 85 percent of trade print books sold in the U.S.” so there is apparently no ebook sales data included.
Per Booksliced, in 2020, the share of market in ebooks looks this way:
Apple Books 7%
PG hadn’t heard of Booksliced until he did a quick search for ebook market share. If anyone can locate additional data on ebook market share, feel free to share in the comments.