-99.81% is the change from 518 to 1
Calculation steps:
[( 1 - 518 ) ÷ 518] x 100 = -99.81%
Formula
Percentage change = [(1 - 518) / 518] x 100
Subtract the new number by the original number
1 - 518 = -517
-517 ÷ 518 = -0.9980694980694981
-0.9980694980694981 x 100 = -99.81%
Example