“Nielsen found that e-book unit sales from reporting publishers were down 16% in 2016 from 2015. Units fell the most in the juvenile fiction segment, where e-book sales dropped 28% in the year and accounted for 10% of total category unit sales in 2016, down from 14%. (E-books have never been a big factor in juvenile nonfiction and accounted for 1% of units sold in 2016.)”