-18.28% is the change from 870 to 711
Calculation steps:
[( 711 - 870 ) ÷ 870] x 100 = -18.28%
Formula
Percentage change = [(711 - 870) / 870] x 100
Subtract the new number by the original number
711 - 870 = -159
-159 ÷ 870 = -0.18275862068965518
-0.18275862068965518 x 100 = -18.28%