Answer based on context:

Critics praised The Sims with positive reviews. It became a best-seller shortly after launch. In 2002, The Sims became the top-selling PC game in history, displacing the game Myst by selling more than 11.3 million copies worldwide. In the United States alone, The Sims sold 3.2 million copies and earned $129.9 million by August 2006 with combined sales of Sims console games reaching 3.5 million units in the United States by July 2006. It was the countrys best-selling computer game between January 2000 and August 2006, and the combined sales of all Sims computer games released in this time period, including The Sims, had reached 17.6 million units in the United States by the latter date. By July 2006, the PlayStation 2 version of The Sims had sold 1.1 million copies and earned $43 million in the United States. Next Generation (magazine) ranked it as the 45th highest-selling game launched for the PlayStation 2, Xbox (console) or GameCube between January 2000 and July 2006 in the United States.

How many years was Sims the United States best-selling computer game?
6.5