-62.62% is the change from 856 to 320
Calculation steps:
[( 320 - 856 ) ÷ 856] x 100 = -62.62%
Formula
Percentage change = [(320 - 856) / 856] x 100
Subtract the new number by the original number
320 - 856 = -536
-536 ÷ 856 = -0.6261682242990654
-0.6261682242990654 x 100 = -62.62%