$9$ years ago Mary purchased shares in a certain mutual fund at Net Asset Value $($NAV$)$ of $$99.$ She reinvested her dividends into the fund, and today she has $5\mathrm{.}8\%$ more shares than when she started. If the fund's NAV has increased by $37\mathrm{.}2\%$ since her purchase, compute the rate of return on her investment if she sells her shares today.

Round your answer to the nearest tenth of a percent.