-40.27% is the change from 519 to 310
Calculation steps:
[( 310 - 519 ) ÷ 519] x 100 = -40.27%
Formula
Percentage change = [(310 - 519) / 519] x 100
Subtract the new number by the original number
310 - 519 = -209
-209 ÷ 519 = -0.4026974951830443
-0.4026974951830443 x 100 = -40.27%