Ten annual returns are listed in the following$$ table:$$

$-19\mathrm{.}2\%16\mathrm{.}6\%18\mathrm{.}4\%-49\mathrm{.}5\%43\mathrm{.}1\%1\mathrm{.}4\%-16\mathrm{.}6\%46\mathrm{.}3\%44\mathrm{.}6\%-3\mathrm{.}7\%$

What is the arithmetic average return over the$10-$year period?