Hmm interesting. Will take this into consideration.
About the completed series ranking: There are 741 series marked as completed, and 30 stories with word "Complete" in their title, but some of them have stuff like "Volume 1 complete!" or something, and a few others are also properly marked as complete. All in all ~11.1 - 11.6% novels, depending on how many of those 30 are actually completed.