-83.28% is the change from 939 to 157
Calculation steps:
[( 157 - 939 ) ÷ 939] x 100 = -83.28%
Formula
Percentage change = [(157 - 939) / 939] x 100
Subtract the new number by the original number
157 - 939 = -782
-782 ÷ 939 = -0.832800851970181
-0.832800851970181 x 100 = -83.28%