The Nielsen SoundScan era started in 1991 .
As of 2016 the album has sold over 5,992,000 copies in the US after the advent of the Nielsen SoundScan era in 1991.On November 24 , 1990 , The Immaculate Collection debuted at number one on the UK Albums Chart , remaining there for nine weeks , becoming the biggest selling UK album in 1990 , also breaking the record for the longest consecutive weeks at number one by a solo female artist , a record that would not be matched until 2011 by Adele 's album 21 .
The Immaculate Collection