-24.21% is the change from 818 to 620
Calculation steps:
[( 620 - 818 ) ÷ 818] x 100 = -24.21%
Formula
Percentage change = [(620 - 818) / 818] x 100
Subtract the new number by the original number
620 - 818 = -198
-198 ÷ 818 = -0.24205378973105135
-0.24205378973105135 x 100 = -24.21%