-61.83% is the change from 668 to 255
Calculation steps:
[( 255 - 668 ) ÷ 668] x 100 = -61.83%
Formula
Percentage change = [(255 - 668) / 668] x 100
Subtract the new number by the original number
255 - 668 = -413
-413 ÷ 668 = -0.6182634730538922
-0.6182634730538922 x 100 = -61.83%