-99.2% is the change from 997 to 8
Calculation steps:
[( 8 - 997 ) ÷ 997] x 100 = -99.2%
Formula
Percentage change = [(8 - 997) / 997] x 100
Subtract the new number by the original number
8 - 997 = -989
-989 ÷ 997 = -0.9919759277833501
-0.9919759277833501 x 100 = -99.2%