As long as the team name is the same, you can use the following steps:
  1. Go to Control->Reports->People->New Thon Team Report
  2. Set the date range
  3. Choose "Filter the report result by conditions I build" option and click Next
  4. Under "Customize Report", select "team name" in the first dropdown, and then put in the team name.
  5. Click Next
  6. Add/Remove fields as desired from the report
  7. Run the report

If the team name is not the same from year to year, or if you want to include all teams from each event in the report, you can use the following steps:
  1. Go to Control->Reports->People->New Thon Team Report
  2. Set the date range
  3. Choose "Limit the report result to the initiatives I choose." option and click Next
  4. Click "Choose Individual Initiatives" then click "next"
  5. Select the events you want to report over and click add
  6. Click Next
  7. Add/Remove fields as desired from the report
  8. Run the report