Suppose we observe the three$-$year Treasury security rate $(1$R$3)$ to be $5\mathrm{.}3$ percent, the expected one$-$year rate next year$$E$(2$r$1)$to be $5\mathrm{.}8$ percent, and the expected one$-$year rate the following year$$E$(3$r$1)$to be $6\mathrm{.}2$ percent. If the unbiased expectations theory of the term structure of interest rates holds, what is the one$-$year Treasury security rate?