-50.48% is the change from 519 to 257
Calculation steps:
[( 257 - 519 ) ÷ 519] x 100 = -50.48%
Formula
Percentage change = [(257 - 519) / 519] x 100
Subtract the new number by the original number
257 - 519 = -262
-262 ÷ 519 = -0.5048169556840078
-0.5048169556840078 x 100 = -50.48%