Consider the following spot interest rates for maturities of one, two, three, and four years.

r_1 = 4.4%; r_2 = 5.2%; r_3 = 5.9%; r_4 = 6.6%

What is the percentage forward rate f_(1,3), where f_(1, k) refers to a forward rate for the period beginning in one year and extending for k years?

(Do not round intermediate calculations. Enter your answers as a percent rounded to 2 decimal places.)