Charles paid $$980\mathrm{.}00$ for a Treasury bill that will mature to $$1,000\mathrm{.}00$ in one year from today. Treasury bills $($T$-$bills$)$ compound interest semi$-$annually $($twice a year$)$ and do not have any coupon payments. Help Charles calculate the annual rate of return $($yield$)$ on this T$-$bill investment.

Provide the answer as a whole number without including the percent $(\%)$ sign.