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

Year Returns

U$.$S$.$ Treasury Bills Inflation

YR: U$.$S$.$ Bills: Inflation:

$13\mathrm{.}90\%1\mathrm{.}24\%$

$23\mathrm{.}752\mathrm{.}38$

$34\mathrm{.}651\mathrm{.}28$

$45\mathrm{.}070\mathrm{.}70$

$52\mathrm{.}876\mathrm{.}52$

$61\mathrm{.}759\mathrm{.}44$

$71\mathrm{.}481\mathrm{.}39$

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

Note: Do not round intermediate calculations and enter your answer as a percent rounded to $2$ decimal places.