-82.32% is the change from 939 to 166
Calculation steps:
[( 166 - 939 ) ÷ 939] x 100 = -82.32%
Formula
Percentage change = [(166 - 939) / 939] x 100
Subtract the new number by the original number
166 - 939 = -773
-773 ÷ 939 = -0.8232161874334398
-0.8232161874334398 x 100 = -82.32%