-99.41% is the change from 509 to 3
Calculation steps:
[( 3 - 509 ) ÷ 509] x 100 = -99.41%
Formula
Percentage change = [(3 - 509) / 509] x 100
Subtract the new number by the original number
3 - 509 = -506
-506 ÷ 509 = -0.9941060903732809
-0.9941060903732809 x 100 = -99.41%