Pie-in-pie (Donut) charts

Can someone suggest me any good plugin on how to create graphs similar to those presented in the images bellow? If someone knows a way to do that with Google Cha开发者_Go百科rts that would be the optimal.

Thanks

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The Google Chart Tools | Pie Charts page shows an example of a concentric pie chart:

According to that page:

pc

A concentric pie chart.

Supply two or more data series.

Is that along the lines of what you are looking for?