Bowker has released Self-Publishing in the United States, 2010-2015: Print and Ebook.
Here's an excerpt from the announcement:
ProQuest affiliate Bowker reveals in its latest industry report that the number of authors who are opting to self-publish continues to rise, with a growth rate of 21% between 2014 and 2015 for print and Ebooks combined. ISBN registrations for self-published titles have grown more than 375% since 2010, climbing from 152,978 ISBNs to 727,125 ISBNs.
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