-18.71% is the change from 668 to 543
Calculation steps:
[( 543 - 668 ) ÷ 668] x 100 = -18.71%
Formula
Percentage change = [(543 - 668) / 668] x 100
Subtract the new number by the original number
543 - 668 = -125
-125 ÷ 668 = -0.18712574850299402
-0.18712574850299402 x 100 = -18.71%