-97.83% is the change from 829 to 18
Calculation steps:
[( 18 - 829 ) ÷ 829] x 100 = -97.83%
Formula
Percentage change = [(18 - 829) / 829] x 100
Subtract the new number by the original number
18 - 829 = -811
-811 ÷ 829 = -0.9782870928829915
-0.9782870928829915 x 100 = -97.83%