Event Participation Percentage By Event Type shows each scout's participation in each type of event over a specified range of dates.

Select this report by going to Calendar → Event Reports → Event Participation Percentage By Event Type.

The report will show how many of the events each scout participated in between the start and end dates you specify on this page.

It only includes those types of events which occurred during the selected date range for which you recorded at least one participant.  If your troop requires attendance to be finalized before giving credit for participation, then this report will only consider events for which the Attendance Finalized box has been checked.