-50.19% is the change from 518 to 258
Calculation steps:
[( 258 - 518 ) ÷ 518] x 100 = -50.19%
Formula
Percentage change = [(258 - 518) / 518] x 100
Subtract the new number by the original number
258 - 518 = -260
-260 ÷ 518 = -0.5019305019305019
-0.5019305019305019 x 100 = -50.19%