Via sourcing from Wikipedia, https://web.archive.org/web/20110213025041/http://www.forbes.com/forbes/2011/0228/technology-gabe-newell-videogames-valve-online-ma

Via sourcing from Wikipedia, https://web.archive.org/web/20110213025041/http://www.forbes.com/forbes/2011/0228/technology-gabe-newell-videogames-valve-online-mayhem.html https://web.archive.org/web/20110213025041/http://www.forbes... notes that digital downloads surpassed physical media in 2010, and ancillary comments also indicate that it's on a pretty steep growth path at that time (Valve was rocking 200% growth rates at that time). Also, FWIW, Valve was regularly making ~one game a year, and only stopped that with the release of Dota 2 in 2013.