All policy reports include graphs that show trend data, including the number of active hosts for a policy over time, the number of controls in a policy over time, and the number of control instances that passed/failed over time. From the trend duration menu, select the number of days (7-90) that you'd like to include in these trend graphs. Note that trend graphs may show aggregate data when a longer time frame is selected.
For more information on trend graphs included in the policy report, see Policy Report: Charts and Graphs.