Things like this are never easy to check. The closest I came to being able to do this was an article on the Guardian's website, which listed the number of copies sold by every Booker winner between 1998 and 2012. Life of Pi was comfortably the biggest seller in this time frame, with just over 1.3 million copies sold; second was Wolf Hall (Hilary Mantel's 2009 winner) with 0.63 million.
© Haydn Thompson 2020