-23.24% is the change from 809 to 621
Calculation steps:
[( 621 - 809 ) ÷ 809] x 100 = -23.24%
Formula
Percentage change = [(621 - 809) / 809] x 100
Subtract the new number by the original number
621 - 809 = -188
-188 ÷ 809 = -0.2323856613102596
-0.2323856613102596 x 100 = -23.24%