From BookNet Canada:
Because you know we can’t pass up an opportunity to combine our love of both charts and Harry Potter, we took to SalesData to investigate.
We looked at the sales trends for all ISBNs with “Harry Potter” in the title, series name, or subtitle, focusing on the last 13 weeks ending Aug. 7, 2016. The below chart shows sales trends for the 10 ISBNs with the most units sold in that period (minus Cursed Child, of course, which would’ve been literally off the charts).
But while Cursed Child and the above colouring books are the biggest new Harry Potter titles in the market, there are actually a total of 23 ISBNs with “Harry Potter” in the title, series name, or subtitle published in 2016 that saw at least one unit sold in the last 52 weeks.