-20.91% is the change from 856 to 677
Calculation steps:
[( 677 - 856 ) ÷ 856] x 100 = -20.91%
Formula
Percentage change = [(677 - 856) / 856] x 100
Subtract the new number by the original number
677 - 856 = -179
-179 ÷ 856 = -0.2091121495327103
-0.2091121495327103 x 100 = -20.91%