The album 'Mine ' has sold more than 2.1 million copies , 'Back to December ' has sold more than 1.8 million copies and 'Ours ' has sold more than 1.3 million copies .
Retrieved October 31 , 2010.In the United States , `` Mean '' has sold 2.5 million copies as of July 2019 , while as of August 2012 `` Mine '' has sold 2,081,000 copies , `` Back to December '' has sold 1,688,000 copies , and `` Ours '' has sold 1,224,000 copies.
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