-4.79% is the change from 856 to 815
Calculation steps:
[( 815 - 856 ) ÷ 856] x 100 = -4.79%
Formula
Percentage change = [(815 - 856) / 856] x 100
Subtract the new number by the original number
815 - 856 = -41
-41 ÷ 856 = -0.04789719626168224
-0.04789719626168224 x 100 = -4.79%