I don‘t think that there can be a 6th Kingsbrige book anyway. There‘s always around 200 years between the books and unless Ken Follett wants to add another prequel, a 6th book would take place in late 20th century/early 21st century.

I don‘t necessarily track these stats but I do record some things as tags on LibraryThing. I don‘t really aim for balanced representation but I do want to „broaden my horizon“ by reading books from more different cultures in the future.