01. 21- ADELE (1-1-1-1-1-1-1) 5,068,400 Still easily clear and looking untouchable, “21” is of course the best selling album of the decade so far and the fourth biggest album of all time selling its five millionth copy in 2016. It spent its first 72 weeks in the top 10 including 23 weeks at No 1 even stealing a cheeky week in the top 10 in 2016 after her Glastonbury stint. It launched her as an international superstar and sold 3.8 million in its first year on the charts becoming the best selling album in the UK for 2011 and then the second biggest seller of 2012- could anything brake her top 2 stranglehold by 2020? Performance in 2017: Only present for 26 weeks and peaking at No 43 but then it’s more than performed overall!