-38.07% is the change from 809 to 501
Calculation steps:
[( 501 - 809 ) ÷ 809] x 100 = -38.07%
Formula
Percentage change = [(501 - 809) / 809] x 100
Subtract the new number by the original number
501 - 809 = -308
-308 ÷ 809 = -0.380716934487021
-0.380716934487021 x 100 = -38.07%