Although appealing to more refined tastes, art as a collectible has not always performed so profitably. During 2004, an auction house sold a sculpture at auction for a price of $10557. Unfortunately for the previous owner, he had purchased it in 1992 at a price of $13933.

What was his annual rate of return on this sculpture?

(Negative amount should be indicated by a minus sign. (Enter your answer as a percentage, omit the "%" sign in your response, and round your answer to 2 decimal places. For example, 0.12345 or 12.345% should be entered as 12.35.)