-80.81% is the change from 891 to 171
Calculation steps:
[( 171 - 891 ) ÷ 891] x 100 = -80.81%
Formula
Percentage change = [(171 - 891) / 891] x 100
Subtract the new number by the original number
171 - 891 = -720
-720 ÷ 891 = -0.8080808080808081
-0.8080808080808081 x 100 = -80.81%