The Service Activity Statistics report gives the number of volunteers, jobs, and hours served for every service activity. [Organized by Service Activity, and Objective, aka Focus Area]. It can also provide the percentage of volunteers.
Reports | Statistics | Service Activity Statistics
When you select for Just primary placements (unduplicated volunteers), the report also reveals the percentage of volunteers within each service activity area.
Just primary placements (unduplicated volunteers).
When you run the report without Just primary placements (unduplicated volunteers) checked you get all the volunteers who have served hours, line by line, per Service Activity, including those with and without a Primary Placement in each activity. Of course the Grand Totals of volunteers are always unduplicated because a volunteer is only counted one time irrespective of serving in more than one activity.