This website says ( ), that in 1990 worldwirde sales exceeded 200 mio. copies. I don't know how accurate this information is. But I know that sales must be pretty much higher by now. For example the US sales of Some Girls are stated as 4 mio, however they are 6 mio. by now. Also Hot Rocks is listed with 6 mio. US sales, however today it's already 12 mio copies in the US.
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