-6% is the change from 867 to 815
Calculation steps:
[( 815 - 867 ) ÷ 867] x 100 = -6%
Formula
Percentage change = [(815 - 867) / 867] x 100
Subtract the new number by the original number
815 - 867 = -52
-52 ÷ 867 = -0.05997693194925029
-0.05997693194925029 x 100 = -6%