-23.95% is the change from 668 to 508
Calculation steps:
[( 508 - 668 ) ÷ 668] x 100 = -23.95%
Formula
Percentage change = [(508 - 668) / 668] x 100
Subtract the new number by the original number
508 - 668 = -160
-160 ÷ 668 = -0.23952095808383234
-0.23952095808383234 x 100 = -23.95%