FYI, courtesy of RIAA:@david_ten
http://www.riaa.com/wp-content/uploads/2018/03/RIAA-Year-End-2017-News-and-Notes.pdf
https://musicbusinessresearch.wordpress.com/2017/05/05/3340/
Thank you!
FWIW, "I’m so glad" my music of choice - Grateful Dead and "related configurations" - falls into a category not covered by the statistics in either of the articles - that would be "freely shared via peer-to-peer trading". :)