-99.5% is the change from 998 to 5
Calculation steps:
[( 5 - 998 ) ÷ 998] x 100 = -99.5%
Formula
Percentage change = [(5 - 998) / 998] x 100
Subtract the new number by the original number
5 - 998 = -993
-993 ÷ 998 = -0.9949899799599199
-0.9949899799599199 x 100 = -99.5%