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

Maturity	1 year	2 years	3 years	4 years	5 years
Zero-Coupon YTMn	3.70%	4.10%	4.30%	4.60%	4.80%

Consider 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 __________%. (Do not round until the final answer. Then round to two decimal places.)