-24.55% is the change from 668 to 504
Calculation steps:
[( 504 - 668 ) ÷ 668] x 100 = -24.55%
Formula
Percentage change = [(504 - 668) / 668] x 100
Subtract the new number by the original number
504 - 668 = -164
-164 ÷ 668 = -0.24550898203592814
-0.24550898203592814 x 100 = -24.55%