-80.39% is the change from 831 to 163
Calculation steps:
[( 163 - 831 ) ÷ 831] x 100 = -80.39%
Formula
Percentage change = [(163 - 831) / 831] x 100
Subtract the new number by the original number
163 - 831 = -668
-668 ÷ 831 = -0.8038507821901324
-0.8038507821901324 x 100 = -80.39%