-23.99% is the change from 817 to 621
Calculation steps:
[( 621 - 817 ) ÷ 817] x 100 = -23.99%
Formula
Percentage change = [(621 - 817) / 817] x 100
Subtract the new number by the original number
621 - 817 = -196
-196 ÷ 817 = -0.23990208078335373
-0.23990208078335373 x 100 = -23.99%