-84.01% is the change from 519 to 83
Calculation steps:
[( 83 - 519 ) ÷ 519] x 100 = -84.01%
Formula
Percentage change = [(83 - 519) / 519] x 100
Subtract the new number by the original number
83 - 519 = -436
-436 ÷ 519 = -0.8400770712909441
-0.8400770712909441 x 100 = -84.01%