A saving bond earns a variable rate of interest that can change six months, with compounding done monthly. The initial rate was 6.8% in early 2015. If that rate continues unchanged for the 3 years of the bond's duration, what is the APY (annual percentage yield) on a $10,000 bond? (Please answer in term of percentage, e.g: 2.5%, and round to 2 decimal places)