Consider the following spot interest rates for maturities of one, two, three, and four years. r1 = 3.8% r2 = 4.2% r3 = 4.9% r4 = 5.7% Assuming a constant real interest rate of 2 percent, what are the approximate expected inflation rates for the next four years? (Do not round intermediate calculations. Enter your answers as a percent rounded to 2 decimal places. Omit the "%" sign in your response.)