-38.15% is the change from 519 to 321
Calculation steps:
[( 321 - 519 ) ÷ 519] x 100 = -38.15%
Formula
Percentage change = [(321 - 519) / 519] x 100
Subtract the new number by the original number
321 - 519 = -198
-198 ÷ 519 = -0.3815028901734104
-0.3815028901734104 x 100 = -38.15%