-97.35% is the change from 491 to 13
Calculation steps:
[( 13 - 491 ) ÷ 491] x 100 = -97.35%
Formula
Percentage change = [(13 - 491) / 491] x 100
Subtract the new number by the original number
13 - 491 = -478
-478 ÷ 491 = -0.9735234215885947
-0.9735234215885947 x 100 = -97.35%