-31.89% is the change from 668 to 455
Calculation steps:
[( 455 - 668 ) ÷ 668] x 100 = -31.89%
Formula
Percentage change = [(455 - 668) / 668] x 100
Subtract the new number by the original number
455 - 668 = -213
-213 ÷ 668 = -0.3188622754491018
-0.3188622754491018 x 100 = -31.89%