"A sunburst is similar to a treemap, except it uses a radial layout. The root node of the tree is at the center, with leaves on the circumference. The area (or angle, depending on implementation) of each arc corresponds to its value." This sunburst uses tooltips for labels: cf. text labels version. [NB: excl OB 'unknown punishment' category.]
Click on arcs to zoom in, click on centre circle to zoom out again. Hover mouse over sections for labels.
Based on this example, additional tooltips code thanks to Tim Sherratt.