-98.61% is the change from 648 to 9
Calculation steps:
[( 9 - 648 ) ÷ 648] x 100 = -98.61%
Formula
Percentage change = [(9 - 648) / 648] x 100
Subtract the new number by the original number
9 - 648 = -639
-639 ÷ 648 = -0.9861111111111112
-0.9861111111111112 x 100 = -98.61%