If it is for a small number of data points, not like the graphic on the page in the link that has many points, you could get the look by plotting each data point as a separate series on the chart, choose a circular data point symbol for each series (you can do them all in one step by clicking on the chart but not clicking on a series, then choosing the round data symbol), set the size of the symbols to correspond with your relative size data (one at a time), then use a color fill for each to fill in center of the circular symbols (also one at a time). I wouldn't recommend this for more than a handful of points.