-81.74% is the change from 909 to 166
Calculation steps:
[( 166 - 909 ) ÷ 909] x 100 = -81.74%
Formula
Percentage change = [(166 - 909) / 909] x 100
Subtract the new number by the original number
166 - 909 = -743
-743 ÷ 909 = -0.8173817381738174
-0.8173817381738174 x 100 = -81.74%