-83.82% is the change from 519 to 84
Calculation steps:
[( 84 - 519 ) ÷ 519] x 100 = -83.82%
Formula
Percentage change = [(84 - 519) / 519] x 100
Subtract the new number by the original number
84 - 519 = -435
-435 ÷ 519 = -0.838150289017341
-0.838150289017341 x 100 = -83.82%