-97.43% is the change from 818 to 21
Calculation steps:
[( 21 - 818 ) ÷ 818] x 100 = -97.43%
Formula
Percentage change = [(21 - 818) / 818] x 100
Subtract the new number by the original number
21 - 818 = -797
-797 ÷ 818 = -0.9743276283618582
-0.9743276283618582 x 100 = -97.43%