-87.13% is the change from 668 to 86
Calculation steps:
[( 86 - 668 ) ÷ 668] x 100 = -87.13%
Formula
Percentage change = [(86 - 668) / 668] x 100
Subtract the new number by the original number
86 - 668 = -582
-582 ÷ 668 = -0.8712574850299402
-0.8712574850299402 x 100 = -87.13%