Over the past four years, Lo$-$Ball Trucking stock returned $22\mathrm{.}5,34\mathrm{.}2,14\mathrm{.}8,$ and $-23\mathrm{.}3$ percent annually. What is the arithmetic average return?$19\mathrm{.}85\%15\mathrm{.}32\%)18\mathrm{.}23\%15\mathrm{.}05\%12\mathrm{.}05\%$