 It spent 11 weeks at the top spot and was the best-selling album of 2009, making Swift—18 years old at the time of the album's release—the youngest artist to have the best-selling album of a calendar year.The album is certified Diamond by the Recording Industry Association of America, for earning over 10 million units in the US, selling over 7.18 million pure copies in the country.Worldwide, it is one of the best-selling albums of the 21st century.