-82.9% is the change from 813 to 139
Calculation steps:
[( 139 - 813 ) ÷ 813] x 100 = -82.9%
Formula
Percentage change = [(139 - 813) / 813] x 100
Subtract the new number by the original number
139 - 813 = -674
-674 ÷ 813 = -0.8290282902829028
-0.8290282902829028 x 100 = -82.9%