You own a stock that had returns of $11\mathrm{.}61$ percent, $-15\mathrm{.}92$ percent, $20\mathrm{.}78$ percent, and $19\mathrm{.}37$ percent over the past four years. What was the arithmetic average return for this stock?

Multiple Choice

$8\mathrm{.}41\%$

$7\mathrm{.}85\%$

$8\mathrm{.}96\%$

$9\mathrm{.}32\%$

$9\mathrm{.}71\%$