-83.19% is the change from 809 to 136
Calculation steps:
[( 136 - 809 ) ÷ 809] x 100 = -83.19%
Formula
Percentage change = [(136 - 809) / 809] x 100
Subtract the new number by the original number
136 - 809 = -673
-673 ÷ 809 = -0.8318912237330037
-0.8318912237330037 x 100 = -83.19%