We’re going to sum everything up: the APA (Audio Publishers Association) reported the rise in audiobook sales in 2018 being 24.5%!

According to Publisher’s Weekly, this is a more accurate percentage. It’s accounting for sales receipts rather than estimated sales. Over 91% of audiobook sales are coming from a digital format…we’ve entered the digital age! Kidding, we’ve been living in it for quite some time now!
The more popular genres include general fiction, mysteries/thrillers/suspense, and sci-fi/fantasy. Nonfiction sales have risen and represent 32.7% of units sold in 2018; starting with general nonfiction, history/biography/memoir, and self-help.
The age group dominating a little over 91% of sales are adults. Young adult titles increased by double digits and audiobooks geared for children rose moderately.
Production of audio has risen 5.8% from 2017!
(This report was based on figures from 20 publishers, including all Big 5 houses.)