-99.19% is the change from 491 to 4
Calculation steps:
[( 4 - 491 ) ÷ 491] x 100 = -99.19%
Formula
Percentage change = [(4 - 491) / 491] x 100
Subtract the new number by the original number
4 - 491 = -487
-487 ÷ 491 = -0.9918533604887984
-0.9918533604887984 x 100 = -99.19%