(Ignore the start date, it includes a year I spent waffling on whether to pay for the service at level 4.)
Overall, I’m very happy with my accuracy given that I’m adding new items at (almost) top speed. I have noticed that my guru+ accuracy has been dropping as I get deeper into the more “abstract” kanji in the mid-20s, so hopefully I can shore that up in the future.
This looks like the same one I have, which is (I think) this one: [Userscript] WaniKani Workload Graph