-98.2% is the change from 998 to 18
Calculation steps:
[( 18 - 998 ) ÷ 998] x 100 = -98.2%
Formula
Percentage change = [(18 - 998) / 998] x 100
Subtract the new number by the original number
18 - 998 = -980
-980 ÷ 998 = -0.9819639278557114
-0.9819639278557114 x 100 = -98.2%