-99% is the change from 499 to 5
Calculation steps:
[( 5 - 499 ) ÷ 499] x 100 = -99%
Formula
Percentage change = [(5 - 499) / 499] x 100
Subtract the new number by the original number
5 - 499 = -494
-494 ÷ 499 = -0.9899799599198397
-0.9899799599198397 x 100 = -99%