-81.24% is the change from 917 to 172
Calculation steps:
[( 172 - 917 ) ÷ 917] x 100 = -81.24%
Formula
Percentage change = [(172 - 917) / 917] x 100
Subtract the new number by the original number
172 - 917 = -745
-745 ÷ 917 = -0.8124318429661941
-0.8124318429661941 x 100 = -81.24%