-99.25% is the change from 668 to 5
Calculation steps:
[( 5 - 668 ) ÷ 668] x 100 = -99.25%
Formula
Percentage change = [(5 - 668) / 668] x 100
Subtract the new number by the original number
5 - 668 = -663
-663 ÷ 668 = -0.9925149700598802
-0.9925149700598802 x 100 = -99.25%