-97.11% is the change from 519 to 15
Calculation steps:
[( 15 - 519 ) ÷ 519] x 100 = -97.11%
Formula
Percentage change = [(15 - 519) / 519] x 100
Subtract the new number by the original number
15 - 519 = -504
-504 ÷ 519 = -0.9710982658959537
-0.9710982658959537 x 100 = -97.11%