-99.03% is the change from 829 to 8
Calculation steps:
[( 8 - 829 ) ÷ 829] x 100 = -99.03%
Formula
Percentage change = [(8 - 829) / 829] x 100
Subtract the new number by the original number
8 - 829 = -821
-821 ÷ 829 = -0.9903498190591074
-0.9903498190591074 x 100 = -99.03%