-18.15% is the change from 518 to 424
Calculation steps:
[( 424 - 518 ) ÷ 518] x 100 = -18.15%
Formula
Percentage change = [(424 - 518) / 518] x 100
Subtract the new number by the original number
424 - 518 = -94
-94 ÷ 518 = -0.18146718146718147
-0.18146718146718147 x 100 = -18.15%