-99.08% is the change from 980 to 9
Calculation steps:
[( 9 - 980 ) ÷ 980] x 100 = -99.08%
Formula
Percentage change = [(9 - 980) / 980] x 100
Subtract the new number by the original number
9 - 980 = -971
-971 ÷ 980 = -0.9908163265306122
-0.9908163265306122 x 100 = -99.08%