Many people have said that buying and selling vintage cars can be very profitable. As a result, you have decided to evaluate whether this is true. During 2003, a car auction house sold a vintage Spyder race car for a price of $10,331,500. The previous owner of the same car, had purchased it in 2000 from a dealer at a price of $12,417,500.

Estimate the annual rate of return for the owner of the vintage Spyder race car? (A negative answer should be indicated by a minus sign. Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.)