At the Circulating Library Data Visualizations: Miscellaneous
Number of Titles Serialized per Year
Note: Titles listed by the date of first serialization. Serialization data post 1890 less comprehensive. Lists of serialized titles per year can be found on the Serializations by Year page.
Number of Titles Published by Genre per Year
Note: Lists of titles by genre can be found on the Genres page.
Number of Titles Illustrated per Year
Note: The sources consulted do not always indicate whether titles are illustrated, so these numbers probably undercount the true totals.
Average Title Length per Year
Note: Title length includes both the main title and the subtitle.