You can put it any way you like, but we know that the US book market is about the same size as what it was 20 years ago [1]. So reading decliced as much as book prices increased. Unless you're talking about another country, of course.
That means people still buy books, not that they still read. What percentage of people who bought Atomic Habits got past the first chapter? Completion rate may have been very different 20 years ago.
[1]: https://ideas.bkconnection.com/10-awful-truths-about-publish... It assumes book price trend = CPI, but I don't buy it. Recreational books are one of the few things that have become cheaper [2], likely due to e-books.
[2]: https://www.in2013dollars.com/Recreational-books/price-infla...