-82.88% is the change from 812 to 139
Calculation steps:
[( 139 - 812 ) ÷ 812] x 100 = -82.88%
Formula
Percentage change = [(139 - 812) / 812] x 100
Subtract the new number by the original number
139 - 812 = -673
-673 ÷ 812 = -0.8288177339901478
-0.8288177339901478 x 100 = -82.88%