-16.02% is the change from 668 to 561
Calculation steps:
[( 561 - 668 ) ÷ 668] x 100 = -16.02%
Formula
Percentage change = [(561 - 668) / 668] x 100
Subtract the new number by the original number
561 - 668 = -107
-107 ÷ 668 = -0.1601796407185629
-0.1601796407185629 x 100 = -16.02%