-0.8% is the change from 998 to 990
Calculation steps:
[( 990 - 998 ) ÷ 998] x 100 = -0.8%
Formula
Percentage change = [(990 - 998) / 998] x 100
Subtract the new number by the original number
990 - 998 = -8
-8 ÷ 998 = -0.008016032064128256
-0.008016032064128256 x 100 = -0.8%