Nielsen SoundScan figures reveal Adele's album 21 has outsold its nearest rival during the first six months of 2011 by 63% after shifting 2.517m copies up until the end of June with Lady GaGa's Born This Way selling 1.540m units. They are the only albums to sell more than 1m units this year, although they will be joined imminently by Mumford & Sons' Sigh No More, which claims third spot with 982,000 sales and has shifted more than 1.5m units ...