During a study, the temperature, in degrees Celsius (${}^{\circ }C$), of the air in a chamber was recorded to the nearest integer at certain times. The scatterplot shows the recorded temperature $y$, in ${}^{\circ }C$, of the air in the chamber $x$ minutes after the start of the study.

How much greater was the average rate of change of the recorded temperature from $x=6$ to $x=7$ minutes than the average rate of change from $x=1$ to $x=2$ minutes?