-81.13% is the change from 917 to 173
Calculation steps:
[( 173 - 917 ) ÷ 917] x 100 = -81.13%
Formula
Percentage change = [(173 - 917) / 917] x 100
Subtract the new number by the original number
173 - 917 = -744
-744 ÷ 917 = -0.8113413304252999
-0.8113413304252999 x 100 = -81.13%