The Annual Return is the average Annual Percentage Yield (APY) of an investment over a $\displaystyle {T}$-year time period.

Annual Return $\displaystyle ={\left(\frac{{\text{Ending Value}}}{{\text{Initial Value}}}\right)}^{{\frac{{1}}{{T}}}}-{1}$

Evelyn pays $5,000 for shares in a new company. She sells the shares 10 years later for $21,000. What was her annual return on this investment? Round your answer to the nearest tenth of a percent.

The Annual Return on Evelyn's investment is %