-0.2% is the change from 998 to 996
Calculation steps:
[( 996 - 998 ) ÷ 998] x 100 = -0.2%
Formula
Percentage change = [(996 - 998) / 998] x 100
Subtract the new number by the original number
996 - 998 = -2
-2 ÷ 998 = -0.002004008016032064
-0.002004008016032064 x 100 = -0.2%