Percentage Circle Graphic

im planning to do percent visualization using a circle, and I'm currently trying to figure out which infrastructure / method to use.

I have used corePlotfor graphs so far and wondered if this is possible

my ideas so far:

1: use a Core Plot piechart and add a covering circle layer in the middle
2: try to use quartz 2d to do it somehow

attached layout, how it should look so that you understand:

What do you think, maybe the best approach is here? id, for example, avoid using hidden subqueries, etc.

is there any simple solution that might be missing?

thanks in advance Sebastian

(PS: I don’t hope for any code here, just general fingerpointin the right direction)