A new report issued by Bowker found that a total of 786,935 ISBNs were issued to self-published authors in 2016, an 8.2% increase over 2015. According to the report, ISBNs for print books rose 11.3% to 638,624 titles, while e-book ISBNs for self-publishers fell 3.2% to 148,311 (a unique ISBN is issued for each format of a book.) Since Bowker measures the number of self-published books by ISBN, its count does not include e-books released by authors through Amazon's KDP program, as they use ASIN identifiers rather than an ISBNs.|
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