-98.66% is the change from 673 to 9
Calculation steps:
[( 9 - 673 ) ÷ 673] x 100 = -98.66%
Formula
Percentage change = [(9 - 673) / 673] x 100
Subtract the new number by the original number
9 - 673 = -664
-664 ÷ 673 = -0.986627043090639
-0.986627043090639 x 100 = -98.66%