Assume the zero-coupon yields on default-free securities are as summarized in the following table:

Maturity Zero-Coupon Yields

1 year 5.00%

2 years 5.50%

3 years 5.80%

4 years 6.10%

5 years 6.40%

Consider a four-year, default-free security with annual coupon payments and a face value of $1,000 that is issued at par. What is the coupon rate of this bond? The par coupon rate is %. (Round to two decimal places.)