The following table summarizes prices of various Treasury zero-coupon bonds (expressed as a percentage of face value):

Maturity (years)

1

2

3

4

5

Price (per $100 face value)

$95.51

$91.05

$86.38

$81.65

$76.51

What is the shape of the yield curve (the curve that showing the relationship between yield to maturity and years to maturity) for the bonds in the above table?

Flat

Downward sloping

U-shaped

Upward sloping