The colour coding is not explained very well.
Grey is explained.
Red/green/blue not so much - some arbitrary bad / meh / good cutoff I suppose.
It also says: "PBP finishers are in brighter blue." No idea what that means; I can only see one shade of blue. Perhaps my monitors or eyeballs are a bit rubbish.
Is the half-blue / half-green line for 2019 supposed to show PBP finishers as a fraction of the total SRs?
If so it's not consistent with the rest of the chart which shows 100% PBP finish rate for every year!