After dividing employees into departments in the user list, department stats are activated. The difference between departments and groups are that employees can only belong to one department where you can be part of several groups.
You can not share directly with departments unless they also figurate as groups.
Statistically, user data only count once in department whereas user stats figure in all groups that they belong to.
How to read the chart
The chart indicates the performance of each department, it both indicates the internal participation as well as their eternal performance. It also indicates the activity on department level.