Apple stock has had returns of $9\%,12\%,17\%,-6\%,8\%,$ and $-2\%$ over the last six years. what is the geometric average return for this stock? $($do not round intermediate calculations and enter your answer as a percentage rounded to $2$ decimal places, e$.$g$.,32\mathrm{.}16.$ do not input a percent sign with your answer.$)$