There's no way to check. At present, there is no unified statistical platform in China, and the data formats of publishing houses, Xinhua bookstores, online bookstores and individual bookstores are not uniform and not networked. The quantity delivered by the publishing house is not the sales quantity, so it cannot be counted. In addition, there are many categories of books, including the classification methods, contents and forms of publishing houses, bookstores and libraries. Not only the above problems cannot be solved, but also the publication of bibliographic information in China is not comprehensive at present. There are more than 100 kinds of information published in a year, and some cooperative books can't even be seen in the bibliography, so it is impossible to query them in a unified way. You can look at the book sales rankings (if any) from mainstream online bookstores, large Xinhua bookstore retail stores and provincial wholesale centers, which may solve some problems.