Inner Radius

Type a number between 0 and 100 to indicate the inner radius of the doughnut chart as a percentage of the outer radius. This controls the size of the doughnut hole (the empty circle in the center of the chart). A value of 0 produces a chart with no hole in the middle (essentially a pie chart) while a value of 50 produces a chart with a medium sized hole, and a value of 80 produces a very large hole.