-50.19% is the change from 516 to 257
Calculation steps:
[( 257 - 516 ) ÷ 516] x 100 = -50.19%
Formula
Percentage change = [(257 - 516) / 516] x 100
Subtract the new number by the original number
257 - 516 = -259
-259 ÷ 516 = -0.501937984496124
-0.501937984496124 x 100 = -50.19%