http://rateyourmusic.com/list/abyss89/the_100_biggest_selling_albums_of_the_80s__usa_/

1999 and Purple Rain make the list.

1999 at #97 with 4.1 million U.S. Sales

Purple Rain at #7 with 13.6 million U.S. Sales

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All though there has been many discrepencies with what the BATMAN album has sold... Numerous places saying it sold over 6 million, over 10 million... In the U.S. it only sold 2 million as certified by RIAA.

Another FYI his #3 highest selling album of the 80's is:

Around The World In A Day- 2.7 Million U.S. Sales