-96.85% is the change from 635 to 20
Calculation steps:
[( 20 - 635 ) ÷ 635] x 100 = -96.85%
Formula
Percentage change = [(20 - 635) / 635] x 100
Subtract the new number by the original number
20 - 635 = -615
-615 ÷ 635 = -0.968503937007874
-0.968503937007874 x 100 = -96.85%