-99.04% is the change from 831 to 8
Calculation steps:
[( 8 - 831 ) ÷ 831] x 100 = -99.04%
Formula
Percentage change = [(8 - 831) / 831] x 100
Subtract the new number by the original number
8 - 831 = -823
-823 ÷ 831 = -0.9903730445246691
-0.9903730445246691 x 100 = -99.04%