Consider a bond that has a price of $$1137\mathrm{.}68,$ a coupon rate of $5\mathrm{.}1\%,$ a yield to maturity of $4\mathrm{.}2\%,$ a face value of $$1000,$ and $25$ years to maturity. What is the current yield? Enter your answer as a percentage. Do not include the percentage sign in your answer.