-86.98% is the change from 668 to 87
Calculation steps:
[( 87 - 668 ) ÷ 668] x 100 = -86.98%
Formula
Percentage change = [(87 - 668) / 668] x 100
Subtract the new number by the original number
87 - 668 = -581
-581 ÷ 668 = -0.8697604790419161
-0.8697604790419161 x 100 = -86.98%