-81.42% is the change from 931 to 173
Calculation steps:
[( 173 - 931 ) ÷ 931] x 100 = -81.42%
Formula
Percentage change = [(173 - 931) / 931] x 100
Subtract the new number by the original number
173 - 931 = -758
-758 ÷ 931 = -0.8141783029001074
-0.8141783029001074 x 100 = -81.42%