-80.73% is the change from 519 to 100
Calculation steps:
[( 100 - 519 ) ÷ 519] x 100 = -80.73%
Formula
Percentage change = [(100 - 519) / 519] x 100
Subtract the new number by the original number
100 - 519 = -419
-419 ÷ 519 = -0.8073217726396917
-0.8073217726396917 x 100 = -80.73%