-99.2% is the change from 998 to 8
Calculation steps:
[( 8 - 998 ) ÷ 998] x 100 = -99.2%
Formula
Percentage change = [(8 - 998) / 998] x 100
Subtract the new number by the original number
8 - 998 = -990
-990 ÷ 998 = -0.9919839679358717
-0.9919839679358717 x 100 = -99.2%