-79.94% is the change from 668 to 134
Calculation steps:
[( 134 - 668 ) ÷ 668] x 100 = -79.94%
Formula
Percentage change = [(134 - 668) / 668] x 100
Subtract the new number by the original number
134 - 668 = -534
-534 ÷ 668 = -0.7994011976047904
-0.7994011976047904 x 100 = -79.94%