-0.9% is the change from 998 to 989
Calculation steps:
[( 989 - 998 ) ÷ 998] x 100 = -0.9%
Formula
Percentage change = [(989 - 998) / 998] x 100
Subtract the new number by the original number
989 - 998 = -9
-9 ÷ 998 = -0.009018036072144289
-0.009018036072144289 x 100 = -0.9%