"Hybrid Theory" debuted at number 16 on the US "Billboard" 200, selling 50,000 copies in its first week. It was certified gold by the Recording Industry Association of America (RIAA) five weeks after its release. In 2001, the album had sold 4.8 million copies in the United States, making it the best-selling album of the year, and it was estimated that the album continued selling 100,000 copies per week in early 2002. Throughout the following years, the album continued to sell at a fast pace and was eventually certified Diamond by the Recording Industry Association of America in 2005 for shipment of ten million copies in the United States; in 2017, it was awarded another level of platinum status for a total of 11× Platinum. To date, the album has sold 27 million copies worldwide, which makes it the best selling debut album of the 21st century. As of July 2017, the album has sold 10,500,000 copies in the US.