During the Moodle Upgrade 3.2 the Chart API and the feedback Analysis were updated, see:
Now it is not possible to easily get the aggregated data as before.There is a (kinda hidden) buttone to "show chart data", but you have to manually open them for every question.
My suggestions are:
1) Make the "show chart data" do "show chart data and hide datagraphic"
2) Add a Button for doing 1) to every datagraphic (Similar to the "expand all" button in every settings page of moodle)
Would be nice if this got implemented. Best regards.