-81.87% is the change from 866 to 157
Calculation steps:
[( 157 - 866 ) ÷ 866] x 100 = -81.87%
Formula
Percentage change = [(157 - 866) / 866] x 100
Subtract the new number by the original number
157 - 866 = -709
-709 ÷ 866 = -0.8187066974595842
-0.8187066974595842 x 100 = -81.87%