Calculate the Maximum growth rate with the following data below:

\begin{tabular}{cll} \hline Time (h) & X(g/l) & S(g/l) \\ \hline 0 & 0.2 & 9.23 \\ 2 & 0.211 & 9.21 \\ 4 & 0.305 & 9.07 \\ 8 & 0.98 & 8.03 \\ 10 & 1.77 & 6.8 \\ 12 & 3.2 & 4.6 \\ 14 & 5.6 & 0.92 \\ 16 & 6.15 & 0.077 \\ 18 & 6.2 & 0 \\ \hline \end{tabular}