If I take the bits and pieces of AAP book sales data out there, I calculate -$178.57 million in sales for adult books. Yes, a negative number.
http://lunch.publishersmarketplace.com/2012/05/trade-sales-up-22-in-february-while-ebook-sales-flatten-out (note, I do not have a paid, any links to further numbers appreciated)
Midiabistro has a children's sale tidbit
The numbers have never been more convoluted than before. One doesn't hide great numbers. I'm sad print is dropping. I'd really like to know more on how mass market paperback is doing; for I fear it might disappear earlier than my mid-2014 prediction. :(