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Over what interval is the function shown in the table decreasing?$\newline$inequality number Sign$\newline$\begin{tabular}{|r|r|c|}$\newline$\hline \multicolumn{$1$}{|c|}{$\ddot{x}$} & $f(x)=3 x^{2}$ & $(x, y)$ \\$\newline$\hline$-2$ & $12$ & $(-2,12)$ \\$\newline$\hline$-1$ & $3$ & $(-1,3)$ \\$\newline$\hline $0$ & $0$ & $(0,0)$ \\$\newline$\hline $1$ & $3$ & $(1,3)$ \\$\newline$\hline $2$ & $12$ & $(2,12)$ \\$\newline$\hline$\newline$\end{tabular}