Can I ask if you have charts like that for precious years? I always thought we had a low amount of porn even before we had a competitor. I've been looking for statistics like these since I had an argument with a fan of our competitor who claimed that porn gave them staying power.
Not to mention it's a source of pride to not be reliant on such things - given that I'm somewhat disappointed that the porn ratio for Vocaloid has gone up.
That particular series of charts only goes back to C87, it seems that data was the not being collected, so it is hard to compare with Kancolle.
C85 is the last chart with Touhou in front, at 2258 circles. Kancolle has 1178 at this time, before it
really blew up.
C86, Kancolle blows past everyone, Touhou drops to 1938.
C87, now separated like that, Touhou second place at 1791.
C88, Touhou second place at 1523.
C89, Touhou third place behind Touken Ranbu, at 1666.
C90, Touhou second place at 1625.
C91, Touhou second place at 1623. (Kancolle at 2824!)
Any idea that "Touhou is dying omg" is just, plain, flat out wrong; it's holding steady. (also Granblue's fanbase sure looks healthy!)