Year-over-year unit sales for 2011 grew by more than 100 percent, the seventh consecutive year of double - not double-digit, but straight-up double sales growth. Stop and think about that for a moment: exponential sales growth for seven uninterrupted years. That's a hell of an accomplishment.
It's also 780 Petabytes of data delivered to over 40 million accounts from across the globe, five million of whom were logged on simultaneously at one point during the 2011 Holiday Sale. More than 14.5 million copies of Steamworks games, including Skyrim, Modern Warfare 3, and Deus Ex: Human Revolution were registered in 2011 alone, a 67 percent jump over the previous year, while in-game item trading broke the 19 million mark. Steam now has over 1800 games on offer, including 18 free-to-play releases.
