As usual, Valve doesn't list the games in order; instead, it places them into Platinum, Gold, Silver, and Bronze groups. Interestingly, most of the Platinum Games—barring those in the New Releases category, obviously—launched before 2020.
https://www.techspot.com/news/88091-check-out-steam-top-selling-most-popular-games.html?utm_source=dlvr.it&utm_medium=blogger
https://www.techspot.com/news/88091-check-out-steam-top-selling-most-popular-games.html?utm_source=dlvr.it&utm_medium=blogger