-86.87% is the change from 518 to 68
Calculation steps:
[( 68 - 518 ) ÷ 518] x 100 = -86.87%
Formula
Percentage change = [(68 - 518) / 518] x 100
Subtract the new number by the original number
68 - 518 = -450
-450 ÷ 518 = -0.8687258687258688
-0.8687258687258688 x 100 = -86.87%