-99.19% is the change from 991 to 8
Calculation steps:
[( 8 - 991 ) ÷ 991] x 100 = -99.19%
Formula
Percentage change = [(8 - 991) / 991] x 100
Subtract the new number by the original number
8 - 991 = -983
-983 ÷ 991 = -0.9919273461150353
-0.9919273461150353 x 100 = -99.19%