Yeah, I generally agree about pie and donut charts. I thought about unrolling this one, so that the inner most circle would just be one long bar, and each successive step would just be an adjacent bar. I'm not sure that makes it better (and might make it worse, since the whole thing might end up being really tall).
There might be a clever way to do this with a tree map, but it wouldn't be particularly intuitive to read.
There might be a clever way to do this with a tree map, but it wouldn't be particularly intuitive to read.