RGraph: HTML5 canvas graph library - Donut chart

Much like the Pie chart, this is a variation useful for comparing mutiple data sets. It's basically a Pie chart with a presentational difference, allowing the multiple data sets. You could also consider a grouped or stacked bar chart, or a multi-line line graph. These types may be better for making direct comparisons.

[No canvas support]
[No canvas support]
[No canvas support]
[No canvas support]
[No canvas support]