-35.03% is the change from 668 to 434
Calculation steps:
[( 434 - 668 ) ÷ 668] x 100 = -35.03%
Formula
Percentage change = [(434 - 668) / 668] x 100
Subtract the new number by the original number
434 - 668 = -234
-234 ÷ 668 = -0.3502994011976048
-0.3502994011976048 x 100 = -35.03%