The comic strip Le Monde sans fin sold more than 514,000 copies last year. For François Le Bescond, editorial director of Dargaud, such a level of sales is "exceptional" The non-fiction comics segment has been growing steadily for the past decade, according to GfK.

The sector has surged by more than 50 per cent in the last five years, the figures show. The book was offered en masse at Christmas, companies ordered it for their collaborators, teachers recommended it to their students.