-0.81% is the change from 495 to 491
Calculation steps:
[( 491 - 495 ) ÷ 495] x 100 = -0.81%
Formula
Percentage change = [(491 - 495) / 495] x 100
Subtract the new number by the original number
491 - 495 = -4
-4 ÷ 495 = -0.00808080808080808
-0.00808080808080808 x 100 = -0.81%