-18.41% is the change from 668 to 545
Calculation steps:
[( 545 - 668 ) ÷ 668] x 100 = -18.41%
Formula
Percentage change = [(545 - 668) / 668] x 100
Subtract the new number by the original number
545 - 668 = -123
-123 ÷ 668 = -0.18413173652694612
-0.18413173652694612 x 100 = -18.41%