-97.81% is the change from 821 to 18
Calculation steps:
[( 18 - 821 ) ÷ 821] x 100 = -97.81%
Formula
Percentage change = [(18 - 821) / 821] x 100
Subtract the new number by the original number
18 - 821 = -803
-803 ÷ 821 = -0.9780755176613886
-0.9780755176613886 x 100 = -97.81%