i make a tabular and i merge two line, it works nice but except for 1 columns

this is my code :
Code: Select all
\begin{tabular}{|c|c|c|c|}
\hline
\textbf{Input data} & \textbf{Original data} & \textbf{Sources} & \textbf{Fitted data} \\
\hline\multirow{2}{2cm}{Chimistry} & x=18 & [13] & \\
\cline{2-2} & y=10 & & \\
\hline
A & A & A & A \\
\hline
\end{tabular}
=> can you explain to me how i can correct it ?
thank for your help