-75.29% is the change from 518 to 128
Calculation steps:
[( 128 - 518 ) ÷ 518] x 100 = -75.29%
Formula
Percentage change = [(128 - 518) / 518] x 100
Subtract the new number by the original number
128 - 518 = -390
-390 ÷ 518 = -0.752895752895753
-0.752895752895753 x 100 = -75.29%