-98.81% is the change from 671 to 8
Calculation steps:
[( 8 - 671 ) ÷ 671] x 100 = -98.81%
Formula
Percentage change = [(8 - 671) / 671] x 100
Subtract the new number by the original number
8 - 671 = -663
-663 ÷ 671 = -0.9880774962742176
-0.9880774962742176 x 100 = -98.81%