-99.4% is the change from 496 to 3
Calculation steps:
[( 3 - 496 ) ÷ 496] x 100 = -99.4%
Formula
Percentage change = [(3 - 496) / 496] x 100
Subtract the new number by the original number
3 - 496 = -493
-493 ÷ 496 = -0.9939516129032258
-0.9939516129032258 x 100 = -99.4%