Various charting-type portlets contain the ability to access the raw data used to generate the chart:
Charting
For more information about the Charting portlet, see Section 8.2, Configuring the Charting Portlet.
Information, Charts tab
For more information about the Information portlet, see Section 8.4, Configuring the Information Portlet.
Chart Builder
For more information about Chart Builder portlet, see Section 10.0, Chart Builder Portlet.
Clicking the d link or using the Chart Data option displays source data used to generate the chart.