Estimate the percentage price change for a 6-year, $1,000 par value bond, with a 6 percent coupon, if the yield rises from 7.8 percent to 12.3 percent. Interest is paid semiannually.

Round your answer to two decimals in percentage. If your answer is a negative number, you should include the negative sign "-". E.g., "-5.0187%" should be entered as "-5.02".