If you want to see Incidents Resolved by your group(s) this tells you how to run a report that will get that information with the default time range of last month.
A few things to note about results you may get with this report:
Click View / Run under Reports in the Application Navigator menu on the left. A list of available reports in ServiceNow loads, depending on your access privileges.
On the reports screen make sure Global or All is selected as a filter and search for All Incidents Resolved in Last Month (My Groups) - Template.