There is a time limit.

A company issued a ten-year $1,000 face value bond at par with a coupon rate of 6.7% paid semiannually. The YTM at the beginning of the third year of the bond (eight years left to maturity) is 8.1%. What was the percentage change in the price of the bond over the past two years? ________% (round to 1 decimal, include - if the value is negative)