-80.84% is the change from 809 to 155
Calculation steps:
[( 155 - 809 ) ÷ 809] x 100 = -80.84%
Formula
Percentage change = [(155 - 809) / 809] x 100
Subtract the new number by the original number
155 - 809 = -654
-654 ÷ 809 = -0.8084054388133498
-0.8084054388133498 x 100 = -80.84%