-81.41% is the change from 839 to 156
Calculation steps:
[( 156 - 839 ) ÷ 839] x 100 = -81.41%
Formula
Percentage change = [(156 - 839) / 839] x 100
Subtract the new number by the original number
156 - 839 = -683
-683 ÷ 839 = -0.8140643623361145
-0.8140643623361145 x 100 = -81.41%