-95.5% is the change from 866 to 39
Calculation steps:
[( 39 - 866 ) ÷ 866] x 100 = -95.5%
Formula
Percentage change = [(39 - 866) / 866] x 100
Subtract the new number by the original number
39 - 866 = -827
-827 ÷ 866 = -0.9549653579676675
-0.9549653579676675 x 100 = -95.5%