-81.12% is the change from 911 to 172
Calculation steps:
[( 172 - 911 ) ÷ 911] x 100 = -81.12%
Formula
Percentage change = [(172 - 911) / 911] x 100
Subtract the new number by the original number
172 - 911 = -739
-739 ÷ 911 = -0.8111964873765093
-0.8111964873765093 x 100 = -81.12%