-25.9% is the change from 668 to 495
Calculation steps:
[( 495 - 668 ) ÷ 668] x 100 = -25.9%
Formula
Percentage change = [(495 - 668) / 668] x 100
Subtract the new number by the original number
495 - 668 = -173
-173 ÷ 668 = -0.25898203592814373
-0.25898203592814373 x 100 = -25.9%