-98.57% is the change from 628 to 9
Calculation steps:
[( 9 - 628 ) ÷ 628] x 100 = -98.57%
Formula
Percentage change = [(9 - 628) / 628] x 100
Subtract the new number by the original number
9 - 628 = -619
-619 ÷ 628 = -0.9856687898089171
-0.9856687898089171 x 100 = -98.57%