-81.23% is the change from 911 to 171
Calculation steps:
[( 171 - 911 ) ÷ 911] x 100 = -81.23%
Formula
Percentage change = [(171 - 911) / 911] x 100
Subtract the new number by the original number
171 - 911 = -740
-740 ÷ 911 = -0.8122941822173436
-0.8122941822173436 x 100 = -81.23%