You$$ve observed the following returns on Pine Computer$$s stock over the past five years: $25\mathrm{.}8$ percent, $14\mathrm{.}2$ percent, $31\mathrm{.}4$ percent, $2\mathrm{.}6$ percent, and $21\mathrm{.}6$ percent. What was the arithmetic average return on the stock over this five$-$year period?