On March 11, 20XX, the existing or current (spot) one-year, two-year, three-year, and four-year zero-coupon Treasury security rates were as follows:

₁R₁ = 1.21%, ₁R₂ = 1.73%, ₁R₃ = 1.97%, ₁R₄ = 2.08%

Using the unbiased expectations theory, calculate the one-year forward rates on zero-coupon Treasury bonds for years two, three, and four as of March 11, 20XX.