-9.88% is the change from 668 to 602
Calculation steps:
[( 602 - 668 ) ÷ 668] x 100 = -9.88%
Formula
Percentage change = [(602 - 668) / 668] x 100
Subtract the new number by the original number
602 - 668 = -66
-66 ÷ 668 = -0.09880239520958084
-0.09880239520958084 x 100 = -9.88%