Using the data provided in the table below, construct the yield curves for August 1991, August 1992, and November 199.

  

Treasury Security Yields August 1991 Maturity 3 months 6 months 1 year 2 years 3 years 4 years 5 years 6 years 7 years 8 years 9 years 10 years 30 years 5.33% 5.39 5.78 6.43 6.80 7,23 7.43 7.51 7.74 7.79 7.86 7.90 8.14 August 1992 3.13% 3.21 3.47 4.19 4.72 4.86 5.60 5.87 6.12 6.32 6.47 6.59 7.39 November 1992 3.20% 3.43 3.80 4.65 5.23 5.72 6.12 6.34 6.56 6.87 6.95 7.18 7.53