>>282253827 (OP)
By December of 2016, roughly 76% of all manga that had begun that year or in December of 2015 had either finished, had a rushed ending, or been cancelled. This was up from approximately 72% of ended manga in 2015, but much lower than 2012's ATH of 81%. Keep in mind these numbers don't just account for major publications like weekly and monthly magazines, but also online-only outlets and self-published titles (It's much harder to get aggregate numbers after 2016-2017 but if you want to do the research it's out there).
2015 in particular was a really rough year for manga, especially Shonen jump - of the 12 manga ended that year, NONE of them were completed, all were cancellations of short series which is surprising. In fact if you look at pre-2020 data, only 2018 saw more manga end in Shonen Jump. You see this reflected throughout the industry - while 2016 had more manga ending, 2015 had more manga ended prematurely.
Another thing to bear in mind is that this data does NOT account for manga that has been put on indefinite haiatus or were oneshots that never got picked up.
I'd imagine that 2024 data would look similar to the mid-2010's average with roughly 70% of manga being cancelled or ended, but again it's hard to find all the hard numbers with how much more stuff is pushed out online. Hope this information was useful, anon.
