-80.1% is the change from 819 to 163
Calculation steps:
[( 163 - 819 ) ÷ 819] x 100 = -80.1%
Formula
Percentage change = [(163 - 819) / 819] x 100
Subtract the new number by the original number
163 - 819 = -656
-656 ÷ 819 = -0.800976800976801
-0.800976800976801 x 100 = -80.1%