-96.39% is the change from 499 to 18
Calculation steps:
[( 18 - 499 ) ÷ 499] x 100 = -96.39%
Formula
Percentage change = [(18 - 499) / 499] x 100
Subtract the new number by the original number
18 - 499 = -481
-481 ÷ 499 = -0.9639278557114228
-0.9639278557114228 x 100 = -96.39%