Your firm is considering issuing a new $20-$year bond to fund a large expansion project. Existing bonds of your firm have a credit rating of AA and a credit spread of $60$ basis points $(0\mathrm{.}60\%),$ which you believe will remain constant with the new issue.

Given the Treasury yields below, what coupon rate will investors likely require to purchase the new bonds? Enter your answer with $2$ decimal places.

Treasury yields as of $27$ August $2016$