-80.02% is the change from 866 to 173
Calculation steps:
[( 173 - 866 ) ÷ 866] x 100 = -80.02%
Formula
Percentage change = [(173 - 866) / 866] x 100
Subtract the new number by the original number
173 - 866 = -693
-693 ÷ 866 = -0.8002309468822171
-0.8002309468822171 x 100 = -80.02%