-99.7% is the change from 998 to 3
Calculation steps:
[( 3 - 998 ) ÷ 998] x 100 = -99.7%
Formula
Percentage change = [(3 - 998) / 998] x 100
Subtract the new number by the original number
3 - 998 = -995
-995 ÷ 998 = -0.996993987975952
-0.996993987975952 x 100 = -99.7%