-17.37% is the change from 518 to 428
Calculation steps:
[( 428 - 518 ) ÷ 518] x 100 = -17.37%
Formula
Percentage change = [(428 - 518) / 518] x 100
Subtract the new number by the original number
428 - 518 = -90
-90 ÷ 518 = -0.17374517374517376
-0.17374517374517376 x 100 = -17.37%