-96.76% is the change from 649 to 21
Calculation steps:
[( 21 - 649 ) ÷ 649] x 100 = -96.76%
Formula
Percentage change = [(21 - 649) / 649] x 100
Subtract the new number by the original number
21 - 649 = -628
-628 ÷ 649 = -0.9676425269645609
-0.9676425269645609 x 100 = -96.76%