-32.39% is the change from 988 to 668
Calculation steps:
[( 668 - 988 ) ÷ 988] x 100 = -32.39%
Formula
Percentage change = [(668 - 988) / 988] x 100
Subtract the new number by the original number
668 - 988 = -320
-320 ÷ 988 = -0.32388663967611336
-0.32388663967611336 x 100 = -32.39%