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This is NOT a great or complete answer, just the start of one, as it's been unanswered for a bit. https://www.statista.com/statistics/288746/global-book-market-by-region/ and https://www.statista....
Answer
#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/43873 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/43873 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
This is NOT a great or complete answer, just the start of one, as it's been unanswered for a bit. [https://www.statista.com/statistics/288746/global-book-market-by-region/](https://www.statista.com/statistics/288746/global-book-market-by-region/) and [https://www.statista.com/topics/4062/book-market-in-europe/](https://www.statista.com/topics/4062/book-market-in-europe/) (I'm not a subscriber to this, so I don't get the complete set of reports, which _may_ answer your question)