-96.63% is the change from 624 to 21
Calculation steps:
[( 21 - 624 ) ÷ 624] x 100 = -96.63%
Formula
Percentage change = [(21 - 624) / 624] x 100
Subtract the new number by the original number
21 - 624 = -603
-603 ÷ 624 = -0.9663461538461539
-0.9663461538461539 x 100 = -96.63%