-83.81% is the change from 809 to 131
Calculation steps:
[( 131 - 809 ) ÷ 809] x 100 = -83.81%
Formula
Percentage change = [(131 - 809) / 809] x 100
Subtract the new number by the original number
131 - 809 = -678
-678 ÷ 809 = -0.8380716934487021
-0.8380716934487021 x 100 = -83.81%