-99.3% is the change from 998 to 7
Calculation steps:
[( 7 - 998 ) ÷ 998] x 100 = -99.3%
Formula
Percentage change = [(7 - 998) / 998] x 100
Subtract the new number by the original number
7 - 998 = -991
-991 ÷ 998 = -0.9929859719438878
-0.9929859719438878 x 100 = -99.3%