U tablici su navedeni podatci o proizvodnji sirove nafte u tisućama tona tijekom jedne godine. $$\begin{array}{|l|c|c|c|c|c|c|c|c|c|c|c|c|} \hline \text{mjeseci} & \text{I.} & \text{II.} & \text{III.} & \text{IV.} & \text{V.} & \text{VI.} & \text{VII.} & \text{VIII.} & \text{IX.} & \text{X.} & \text{XI.} & \text{XII.} \\ \hline \text{proizvodnja} & & & & & & & & & & & & \\ \text{u tisućama} & 55 & 54 & 56 & 57 & 59 & 57 & 59 & 58 & 54 & 57 & 55 & 57 \\ \text{tona} & & & & & & & & & & & & \\ \hline \end{array}$$$ \begin{array}{|l|c|c|c|c|c|c|c|c|c|c|c|c|} \hline \text{mjeseci} & \text{I.} & \text{II.} & \text{III.} & \text{IV.} & \text{V.} & \text{VI.} & \text{VII.} & \text{VIII.} & \text{IX.} & \text{X.} & \text{XI.} & \text{XII.} \\ \hline \text{proizvodnja} & & & & & & & & & & & & \\ \text{u tisućama} & 55 & 54 & 56 & 57 & 59 & 57 & 59 & 58 & 54 & 57 & 55 & 57 \\ \text{tona} & & & & & & & & & & & & \\ \hline \end{array} $