-96.3% is the change from 621 to 23
Calculation steps:
[( 23 - 621 ) ÷ 621] x 100 = -96.3%
Formula
Percentage change = [(23 - 621) / 621] x 100
Subtract the new number by the original number
23 - 621 = -598
-598 ÷ 621 = -0.9629629629629629
-0.9629629629629629 x 100 = -96.3%