In Wikipedia's List of best-selling albums, Rumours got 30.3 million albums world wide. I guess it must be complicated to obtain global sales statistics up to the same date. Anyway it is interesting how results are so different among countries. I'm sure Thriller is and will always be the top selling album around the world. I've read sometime Eagles GH is higher than Thriller in the US list, but I really doubt it will be ever higher than Thriller in the world sales list. Thriller was a phenomenon that doesn't just or always happen.
And in the same page expanding the Rumours statistic, the US number is 21 million. It doesn't specify what year is the data from, but the source is
https://www.riaa.com/gold-platinum/ . I don't know how official is that webpage and info.
https://en.wikipedia.org/wiki/List_o...copies_or_more