From Publisher's weekly:
http://www.publishersweekly.com/pw/b...-february.html
Quote:
For the first two months of 2015, adult book sales were down 7.5% and sales of children/young adult titles were off 15.5%. At the end of the two month period, e-books accounted for 31.3% of adult sales compared to 33.0% in the first two months of 2014. In the children/young adult category, e-books accounted for 13.0% of sales in the January-February period in 2015, down from 18.5% in the comparable 2014 period.
Results are based on sales from 1,210 publishers who supply data to AAP’s StatShot program.
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AAP numbers are normally year to year dollars, not unit sales.
Recently, they've been masking the decline of mass market paperback by combining those sales with trade paperbacks (so they could report growth in paperback) but apparently this time the drop was too big to mask so they're back to split reporting.
It lets them report a gain *somewhere*.
Gory details at the source.