Calculate the standard deviation of the following returns.

Year Return

$10\mathrm{.}16$

$20\mathrm{.}23$

$30\mathrm{.}26$

$4-0\mathrm{.}07$

$50\mathrm{.}28$

Enter the answer with $4$ decimals, e$.$g$.0\mathrm{.}1234.$