-63.79% is the change from 856 to 310
Calculation steps:
[( 310 - 856 ) ÷ 856] x 100 = -63.79%
Formula
Percentage change = [(310 - 856) / 856] x 100
Subtract the new number by the original number
310 - 856 = -546
-546 ÷ 856 = -0.6378504672897196
-0.6378504672897196 x 100 = -63.79%