-80.5% is the change from 836 to 163
Calculation steps:
[( 163 - 836 ) ÷ 836] x 100 = -80.5%
Formula
Percentage change = [(163 - 836) / 836] x 100
Subtract the new number by the original number
163 - 836 = -673
-673 ÷ 836 = -0.8050239234449761
-0.8050239234449761 x 100 = -80.5%