-99.4% is the change from 998 to 6
Calculation steps:
[( 6 - 998 ) ÷ 998] x 100 = -99.4%
Formula
Percentage change = [(6 - 998) / 998] x 100
Subtract the new number by the original number
6 - 998 = -992
-992 ÷ 998 = -0.9939879759519038
-0.9939879759519038 x 100 = -99.4%