Digital growth at the Hachette Book Group’s net sales from digital products which include eBooks and audiobooks increased 130% in 2011. These digital products represented 22% of the company’s overall revenue in 2011, compared with 8% in 2010. The publisher also reported today that it had 62 titles hit the New York Times eBook bestseller chart in 2011.

Lagardère SCA, Hachette’s parent company released these figures today along with its 2011 full year revenue report. While Lagardère’s net sales for 2011 were €7,657m, a 3.9% drop on a reported basis from 2010, digital books did well across the group.

At Hachette Livre, fourth quarter eBook sales accounted for 20% of adult trade sales in the U.S. and 10% in the U.K.  In 2011 eBooks accounted for 6% of Lagardère Publishing’s total net sales.