-23.12% is the change from 519 to 399
Calculation steps:
[( 399 - 519 ) ÷ 519] x 100 = -23.12%
Formula
Percentage change = [(399 - 519) / 519] x 100
Subtract the new number by the original number
399 - 519 = -120
-120 ÷ 519 = -0.23121387283236994
-0.23121387283236994 x 100 = -23.12%