From
Marginal Revolution I got a reference to this in
The Telegraph AuthorVolume sold
1J K Rowling29,084,999£225.9m2Roger Hargreaves14,163,141£26.6m3Dan Brown13,372,007£74.1m4Jacqueline Wilson12,673,148£69.9m5Terry Pratchett10,455,397£77.2m6John Grisham9,862,998£65.9m7Richard Parsons9,561,776£49.2m8Danielle Steel9,119,149£51m9James Patterson8,
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