-21.35% is the change from 843 to 663
Calculation steps:
[( 663 - 843 ) ÷ 843] x 100 = -21.35%
Formula
Percentage change = [(663 - 843) / 843] x 100
Subtract the new number by the original number
663 - 843 = -180
-180 ÷ 843 = -0.21352313167259787
-0.21352313167259787 x 100 = -21.35%