-80.1% is the change from 809 to 161
Calculation steps:
[( 161 - 809 ) ÷ 809] x 100 = -80.1%
Formula
Percentage change = [(161 - 809) / 809] x 100
Subtract the new number by the original number
161 - 809 = -648
-648 ÷ 809 = -0.8009888751545118
-0.8009888751545118 x 100 = -80.1%