Sony has released its consolidated financial results for the fiscal year that ended on March 31, 2019 (FY2018). Although hardware sales for the PlayStation 4 have slowed down, they are still selling at an impressive rate. Total sales for the PS4 stand at 96.8 million units and should easily top 100 million before the PS5 is released.
https://www.notebookcheck.net/Sony-will-have-sold-over-100-million-PlayStation-4-consoles-by-the-time-the-PS5-is-released.419388.0.html