-81.78% is the change from 911 to 166
Calculation steps:
[( 166 - 911 ) ÷ 911] x 100 = -81.78%
Formula
Percentage change = [(166 - 911) / 911] x 100
Subtract the new number by the original number
166 - 911 = -745
-745 ÷ 911 = -0.8177826564215148
-0.8177826564215148 x 100 = -81.78%