Calculate the 2-year, 3-year and 4-year zero-coupon yields and discount factors consistent with the following bonds. The 1-year yield is 10.00%.

Maturity

Coupon

Price

2 years

9.0%

(annual)

97.70

3 years

7.0%

(annual)

90.90

4 years

11.0%

(annual)

99.40

What are the 1-year v 2-year, 2-year v 3-year and 3-year v 4-year forward-forward yields?