-79.48% is the change from 809 to 166
Calculation steps:
[( 166 - 809 ) ÷ 809] x 100 = -79.48%
Formula
Percentage change = [(166 - 809) / 809] x 100
Subtract the new number by the original number
166 - 809 = -643
-643 ÷ 809 = -0.7948084054388134
-0.7948084054388134 x 100 = -79.48%
Example