A month by month graph view of the number of books started vs finished for every month during the year (+ balance of the current number of "currently reading" books as of the last day of the month at 23:59:59).

EG: [month] started, finished, "currently reading"
[January] +1 book, -0 book, 1 c.r.
[February] +0 book, -0 book, 1 c.r.
[March] +3 books, -1 book, 3 c.r.
[April] +0 book, -1 book, 2 c.r.
[May] +2 books, -1 book, 3 c.r.
etc.

Maybe it could be visualised in a format similar to Instagram's followers number insight stats.

I don't know if it's a pretty niche request (I wasn't able to find a similar request, hopefully it's not a duplicate), I love graphs and I'd love to see how every time December comes I am in the middle of 5+ books.