The International Publishers Association has released "IPA-WIPO Publishing Industry Pilot Survey Published."
Here's an excerpt:
The IPA has initiated a partnership with the World Intellectual Property Organisation, WIPO, to help gather global statistics on the book industry. It will be updated and added to each year, enabling year-on-year comparisons and measuring the impact of policy and market changes on the sector. The WIPO-IPA pilot study conducted in 2017 as a first step to a full survey already includes interesting data about 2016 trends.