The RIAA provides the most comprehensive data on U.S. recorded music revenues and shipments dating all the way back to 1973. This is the definitive source of revenue data for the recorded music industry in the United States. source
1998 was the peak revenue for recorded music in the US, adjusted for inflation. Paid streaming subscriptions now dominate, as you would expect, but the revenues are way down. Spotify has never turned an annual profit.