$8.$ Consider the following table for a seven$-$year period:

Year Returns

U$.$S$.$ Treasury Bills Inflation

$14\mathrm{.}00\%1\mathrm{.}26\%$

$23\mathrm{.}852\mathrm{.}40$

$34\mathrm{.}751\mathrm{.}30$

$45\mathrm{.}170\mathrm{.}72$

$52\mathrm{.}976\mathrm{.}54$

$61\mathrm{.}859\mathrm{.}46$

$71\mathrm{.}581\mathrm{.}41$

a$.$ What was the average real return for Treasury bills for this time period?