-25.7% is the change from 856 to 636
Calculation steps:
[( 636 - 856 ) ÷ 856] x 100 = -25.7%
Formula
Percentage change = [(636 - 856) / 856] x 100
Subtract the new number by the original number
636 - 856 = -220
-220 ÷ 856 = -0.2570093457943925
-0.2570093457943925 x 100 = -25.7%