In the "Statistics" tab, you can find activity data per unit/department including the activity of the instructors.
Click on the "Statistics" tab and select the desired contact, in the top left corner. Select "Activity per unit with instructor" in the drop down menu named "Report type" in the upper left corner. You should now see activity data for your unit, including activity score, number of sessions, hours, days, calories, and degree of satisfaction.
You can filter the results by time period using the drop-down menu called "Period".