Worldwide Sales - first 10 weeks graph

The graph show the average decrease of worldwide sales in first 10 weeks for the biggest 1° week seller of last years.
As you can see the second week always show a big decrease of sales, in this case of 9 albums the average fall is -53% (with 50 Cent at 72%)

Eagles & Alicia Keys are out of the graph because their graph is too much altered by Xmas weeks.

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