You purchased a zero coupon bond one year ago for $116.86. The bond has a par value of $1,000 and the market interest rate is now 7 percent. If the bond had 31 years to maturity when you originally purchased it, what was your total return for the past year? Assume semiannual compounding. (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.)