The following table shows the prices of a sample of Treasury bonds, all of which have coupon rates of zero. Each bond makes a single payment at maturity. Years to Maturity Price (% of face value) 1 97.052% 2 93.551 3 89.744 4 85.680 What is the 1-year interest rate? Note: Do not round intermediate calculations. Enter your answer as a percent rounded to 2 decimal places. What is the 2-year interest rate? Note: Do not round intermediate calculations. Enter your answer as a percent rounded to 2 decimal places. What is the 3-year interest rate? Note: Do not round intermediate calculations. Enter your answer as a percent rounded to 2 decimal places. What is the 4-year interest rate? Note: Do not round intermediate calculations. Enter your answer as a percent rounded to 2 decimal places. Is the yield curve upward-sloping, downward-sloping, or flat? Is this the usual shape of the yield curve