-98.78% is the change from 491 to 6
Calculation steps:
[( 6 - 491 ) ÷ 491] x 100 = -98.78%
Formula
Percentage change = [(6 - 491) / 491] x 100
Subtract the new number by the original number
6 - 491 = -485
-485 ÷ 491 = -0.9877800407331976
-0.9877800407331976 x 100 = -98.78%