-79.85% is the change from 809 to 163
Calculation steps:
[( 163 - 809 ) ÷ 809] x 100 = -79.85%
Formula
Percentage change = [(163 - 809) / 809] x 100
Subtract the new number by the original number
163 - 809 = -646
-646 ÷ 809 = -0.7985166872682324
-0.7985166872682324 x 100 = -79.85%