The strongest performing trade format was downloadable audio, where sales jumped 36.1%. Sales of physical audio, however, continued to struggle; they were down 11.4% in the four month period. Hardcover sales rose 11.8% in the period, and trade paperback and mass market paperback sales inched ahead 1.4%. In a bit of a surprise, sales of board books, which had been growing quickly, fell 5.5%.