-5.06% is the change from 870 to 826
Calculation steps:
[( 826 - 870 ) ÷ 870] x 100 = -5.06%
Formula
Percentage change = [(826 - 870) / 870] x 100
Subtract the new number by the original number
826 - 870 = -44
-44 ÷ 870 = -0.05057471264367816
-0.05057471264367816 x 100 = -5.06%