-97.91% is the change from 623 to 13
Calculation steps:
[( 13 - 623 ) ÷ 623] x 100 = -97.91%
Formula
Percentage change = [(13 - 623) / 623] x 100
Subtract the new number by the original number
13 - 623 = -610
-610 ÷ 623 = -0.9791332263242376
-0.9791332263242376 x 100 = -97.91%