-80.65% is the change from 858 to 166
Calculation steps:
[( 166 - 858 ) ÷ 858] x 100 = -80.65%
Formula
Percentage change = [(166 - 858) / 858] x 100
Subtract the new number by the original number
166 - 858 = -692
-692 ÷ 858 = -0.8065268065268065
-0.8065268065268065 x 100 = -80.65%