-99.81% is the change from 519 to 1
Calculation steps:
[( 1 - 519 ) ÷ 519] x 100 = -99.81%
Formula
Percentage change = [(1 - 519) / 519] x 100
Subtract the new number by the original number
1 - 519 = -518
-518 ÷ 519 = -0.9980732177263969
-0.9980732177263969 x 100 = -99.81%