-21.26% is the change from 842 to 663
Calculation steps:
[( 663 - 842 ) ÷ 842] x 100 = -21.26%
Formula
Percentage change = [(663 - 842) / 842] x 100
Subtract the new number by the original number
663 - 842 = -179
-179 ÷ 842 = -0.21258907363420426
-0.21258907363420426 x 100 = -21.26%