-4.02% is the change from 870 to 835
Calculation steps:
[( 835 - 870 ) ÷ 870] x 100 = -4.02%
Formula
Percentage change = [(835 - 870) / 870] x 100
Subtract the new number by the original number
835 - 870 = -35
-35 ÷ 870 = -0.040229885057471264
-0.040229885057471264 x 100 = -4.02%