One investor has a stock with annual returns for the past five years as follows. The arithmetic average of these returns is:

Year

$1$

$2$

$3$

$4$

$5$

$3\mathrm{.}20\%$

$4\mathrm{.}00\%$

$4\mathrm{.}20\%$

$3\mathrm{.}40\%$

$3\mathrm{.}60\%$

Return

$5\%$

$6\%$

$10\%$

$-5\%$

$0\%$