-1.88% is the change from 957 to 939
Calculation steps:
[( 939 - 957 ) ÷ 957] x 100 = -1.88%
Formula
Percentage change = [(939 - 957) / 957] x 100
Subtract the new number by the original number
939 - 957 = -18
-18 ÷ 957 = -0.018808777429467086
-0.018808777429467086 x 100 = -1.88%