A $10-$year maturity mortgage$-$backed bond is issued. The bond is a zero$-$coupon bond that promises to pay $$10,000($par$)$ after $10$ years. At initial issue, bond market investors require a $5\mathrm{.}50$ percent interest rate return on the bond. After holding the bond for five years you decide to sell and bond market investors require an $8$ percent interest rate return. What is your annual yield for the five years you held the bond?