In a percent stacked area chart, multiple series are stacked vertically and the values appear as a percentage of the total. Figure 8‑9 shows the sales values in percentages instead of the actual numbers as shown in the previous area charts.

The percent stacked area chart is meaningful only when displaying and comparing multiple series. If displaying only one series, the percent stacked area chart appears as in the example shown in Figure 8‑10. The sales percentage of one region compared to the whole is 100%.