A corporate bond pays interest twice a year and has 20 years to maturity, a face value of $1,000 and a coupon rate of 6%. The bond's current price is $1,448.74. It is callable starting 14 years from now (years to call) at a call price of $1,118. What is the bond's yield to call? Enter your answer as a decimal (i.e. enter 0.01 for 1%).