-97.91% is the change from 621 to 13
Calculation steps:
[( 13 - 621 ) ÷ 621] x 100 = -97.91%
Formula
Percentage change = [(13 - 621) / 621] x 100
Subtract the new number by the original number
13 - 621 = -608
-608 ÷ 621 = -0.9790660225442834
-0.9790660225442834 x 100 = -97.91%