For the elevation and temperature data given in the table, the existing lapse rate in the environment is _______________ $\text{C}^{\circ} / 100 \mathrm{~m}$ (round off to two decimal places).
$\begin{array}{|c|c|}
\hline \textbf{Elevation from ground level (m)} & \textbf{Temperature} (^\circ \textbf{C}) \\
\hline 5 & 14.2 \\
\hline 325 & 16.9 \\
\hline
\end{array}$