-81.18% is the change from 866 to 163
Calculation steps:
[( 163 - 866 ) ÷ 866] x 100 = -81.18%
Formula
Percentage change = [(163 - 866) / 866] x 100
Subtract the new number by the original number
163 - 866 = -703
-703 ÷ 866 = -0.8117782909930716
-0.8117782909930716 x 100 = -81.18%