-87.01% is the change from 939 to 122
Calculation steps:
[( 122 - 939 ) ÷ 939] x 100 = -87.01%
Formula
Percentage change = [(122 - 939) / 939] x 100
Subtract the new number by the original number
122 - 939 = -817
-817 ÷ 939 = -0.8700745473908413
-0.8700745473908413 x 100 = -87.01%