-27.1% is the change from 668 to 487
Calculation steps:
[( 487 - 668 ) ÷ 668] x 100 = -27.1%
Formula
Percentage change = [(487 - 668) / 668] x 100
Subtract the new number by the original number
487 - 668 = -181
-181 ÷ 668 = -0.27095808383233533
-0.27095808383233533 x 100 = -27.1%