-95.51% is the change from 668 to 30
Calculation steps:
[( 30 - 668 ) ÷ 668] x 100 = -95.51%
Formula
Percentage change = [(30 - 668) / 668] x 100
Subtract the new number by the original number
30 - 668 = -638
-638 ÷ 668 = -0.9550898203592815
-0.9550898203592815 x 100 = -95.51%