An investment portfolio had the following returns

$($losses$)$over the past $5$years$.$ Calculate the average return for the $5-$year period.

Enter your final value $($ as a percent; do not include an symbols $)$

$$

$10.6,11\mathrm{.}4,9\mathrm{.}3,6\mathrm{.}8,-2\mathrm{.}3$