I excluded non-fiction.
Digital content sales rose 64% in the first quarter ended March 31 at Simon & Schuster, helping to lift total revenue 14%, to $176 million. Operating income before depreciation and amortization (and before impairment charges) rose 43%, to $10 million; both quarters has charges of $2 million.
In addition to higher digital sales, which accounted for 26% of total revenue, sales of print books also rose in the quarter.
The 26% for Simon and Schuster is for all books (non-fiction and fiction). It's a known fact that fiction sell better than none-fiction for ebook. So Fiction definitely higher than 26%.
In addition, a vast majority of indie publishers, I believe ebooks > print books now. Same for self-publishers in which ebook is like 90% and print book 10% of total sales. Same with Amazon Publishing (which now has something like 300+ authors and over 1,000 books).