Sales of #TheWitcher3 by hardware platform (units sold)— Nathan (@DarkDetectiveNL) April 8, 2020
Pixel counting from this graph gives rough results per platform:
PC: ~12.4m#PS4: ~10.8m#XboxOne: ~4.3m#NintendoSwitch: ~0.7m
Total: ~28.3m pic.twitter.com/RkQUtYsxzg
As you can see, Witcher 3 got a big sales boost in 2019 making it the 2nd strongest year for the game since it released, largely thanks to the release of the Netflix show at the end of the year and the Switch release.