-84.59% is the change from 519 to 80
Calculation steps:
[( 80 - 519 ) ÷ 519] x 100 = -84.59%
Formula
Percentage change = [(80 - 519) / 519] x 100
Subtract the new number by the original number
80 - 519 = -439
-439 ÷ 519 = -0.8458574181117534
-0.8458574181117534 x 100 = -84.59%