-96.95% is the change from 656 to 20
Calculation steps:
[( 20 - 656 ) ÷ 656] x 100 = -96.95%
Formula
Percentage change = [(20 - 656) / 656] x 100
Subtract the new number by the original number
20 - 656 = -636
-636 ÷ 656 = -0.9695121951219512
-0.9695121951219512 x 100 = -96.95%