-80.14% is the change from 866 to 172
Calculation steps:
[( 172 - 866 ) ÷ 866] x 100 = -80.14%
Formula
Percentage change = [(172 - 866) / 866] x 100
Subtract the new number by the original number
172 - 866 = -694
-694 ÷ 866 = -0.8013856812933026
-0.8013856812933026 x 100 = -80.14%