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You should have included the month-year of release for the book. Then you could have separated out new books from books that have been out a year and so on. With no date information, the data you collect is less useful.
For December, BTW, my paperbacks are outselling my ebooks. Might be an artifact of Xmas gift giving. Dunno. But I have less than 3 full months of data, so I don't think I have enough data to draw any conclusions.
-David
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