-96.79% is the change from 623 to 20
Calculation steps:
[( 20 - 623 ) ÷ 623] x 100 = -96.79%
Formula
Percentage change = [(20 - 623) / 623] x 100
Subtract the new number by the original number
20 - 623 = -603
-603 ÷ 623 = -0.9678972712680578
-0.9678972712680578 x 100 = -96.79%