Hi Billy1,
We're unable to run a report that compares your purchases for each supplier over a period of time, like compare your yearly purchases in the past five years. What we can do is run a report like Purchases by Supplier Detail or Expenses by Supplier Summary for each year, depending on the period you need. Then, you can export them to Excel and combine the data in one sheet.
To run the reports I mentioned, just go to Reports and search for Purchases by Supplier Detail or Expenses by Supplier Summary. Then, change the date range, and export it report to Excel.
You can always go back to this thread if you have other questions.