-0.99% is the change from 808 to 800
Calculation steps:
[( 800 - 808 ) ÷ 808] x 100 = -0.99%
Formula
Percentage change = [(800 - 808) / 808] x 100
Subtract the new number by the original number
800 - 808 = -8
-8 ÷ 808 = -0.009900990099009901
-0.009900990099009901 x 100 = -0.99%