-81.89% is the change from 856 to 155
Calculation steps:
[( 155 - 856 ) ÷ 856] x 100 = -81.89%
Formula
Percentage change = [(155 - 856) / 856] x 100
Subtract the new number by the original number
155 - 856 = -701
-701 ÷ 856 = -0.8189252336448598
-0.8189252336448598 x 100 = -81.89%