-68.86% is the change from 668 to 208
Calculation steps:
[( 208 - 668 ) ÷ 668] x 100 = -68.86%
Formula
Percentage change = [(208 - 668) / 668] x 100
Subtract the new number by the original number
208 - 668 = -460
-460 ÷ 668 = -0.688622754491018
-0.688622754491018 x 100 = -68.86%