-37.33% is the change from 809 to 507
Calculation steps:
[( 507 - 809 ) ÷ 809] x 100 = -37.33%
Formula
Percentage change = [(507 - 809) / 809] x 100
Subtract the new number by the original number
507 - 809 = -302
-302 ÷ 809 = -0.37330037082818296
-0.37330037082818296 x 100 = -37.33%