The past six monthly returns for a company's stock are $4\mathrm{.}22$ percent, $3\mathrm{.}12$ percent, $2\mathrm{.}2$ percent, $3\mathrm{.}1$ percent, $1\mathrm{.}8$ percent, and $5\mathrm{.}2$ percent. What's the average monthly return over those six months?