-96.92% is the change from 649 to 20
Calculation steps:
[( 20 - 649 ) ÷ 649] x 100 = -96.92%
Formula
Percentage change = [(20 - 649) / 649] x 100
Subtract the new number by the original number
20 - 649 = -629
-629 ÷ 649 = -0.9691833590138675
-0.9691833590138675 x 100 = -96.92%