-16.9% is the change from 870 to 723
Calculation steps:
[( 723 - 870 ) ÷ 870] x 100 = -16.9%
Formula
Percentage change = [(723 - 870) / 870] x 100
Subtract the new number by the original number
723 - 870 = -147
-147 ÷ 870 = -0.16896551724137931
-0.16896551724137931 x 100 = -16.9%