-99.19% is the change from 990 to 8
Calculation steps:
[( 8 - 990 ) ÷ 990] x 100 = -99.19%
Formula
Percentage change = [(8 - 990) / 990] x 100
Subtract the new number by the original number
8 - 990 = -982
-982 ÷ 990 = -0.9919191919191919
-0.9919191919191919 x 100 = -99.19%