-49.15% is the change from 999 to 508
Calculation steps:
[( 508 - 999 ) ÷ 999] x 100 = -49.15%
Formula
Percentage change = [(508 - 999) / 999] x 100
Subtract the new number by the original number
508 - 999 = -491
-491 ÷ 999 = -0.4914914914914915
-0.4914914914914915 x 100 = -49.15%