-13.32% is the change from 668 to 579
Calculation steps:
[( 579 - 668 ) ÷ 668] x 100 = -13.32%
Formula
Percentage change = [(579 - 668) / 668] x 100
Subtract the new number by the original number
579 - 668 = -89
-89 ÷ 668 = -0.13323353293413173
-0.13323353293413173 x 100 = -13.32%