You examine the following yields for Treasury bonds of different maturities. Calculate the curvature of the yield curve using conventional methods.

Maturity Yield

$12\mathrm{.}98\%$

$23\mathrm{.}14\%$

$53\mathrm{.}33\%$

$103\mathrm{.}48\%$

$203\mathrm{.}54\%$

$303\mathrm{.}61\%$