-22.31% is the change from 668 to 519
Calculation steps:
[( 519 - 668 ) ÷ 668] x 100 = -22.31%
Formula
Percentage change = [(519 - 668) / 668] x 100
Subtract the new number by the original number
519 - 668 = -149
-149 ÷ 668 = -0.22305389221556887
-0.22305389221556887 x 100 = -22.31%