The deviation of a data point from the mean is calculated by subtracting the mean from the data point.
In this case, the mean is 59, and the data point is 43.
So, the deviation is:
\[ \text{Deviation} = \text{Data Point} - \text{Mean} = 43 - 59 = -16. \]
Therefore, the answer is:
−16 (negative 16).