-98.56% is the change from 623 to 9
Calculation steps:
[( 9 - 623 ) ÷ 623] x 100 = -98.56%
Formula
Percentage change = [(9 - 623) / 623] x 100
Subtract the new number by the original number
9 - 623 = -614
-614 ÷ 623 = -0.985553772070626
-0.985553772070626 x 100 = -98.56%