-83.86% is the change from 861 to 139
Calculation steps:
[( 139 - 861 ) ÷ 861] x 100 = -83.86%
Formula
Percentage change = [(139 - 861) / 861] x 100
Subtract the new number by the original number
139 - 861 = -722
-722 ÷ 861 = -0.8385598141695703
-0.8385598141695703 x 100 = -83.86%