You purchased a zero$-$coupon bond one year ago for $$284\mathrm{.}33.$ The market interest rate is now $9$ percent. Assume semiannual compounding. If the bond had $15$ years to maturity when you originally purchased it$,$ what was your total return for the past year?

Note: Do not round intermediate calculations and enter your answer as a percent rounded to $2$ decimal places, e$.$g$.,32\mathrm{.}16.$