-15.63% is the change from 870 to 734
Calculation steps:
[( 734 - 870 ) ÷ 870] x 100 = -15.63%
Formula
Percentage change = [(734 - 870) / 870] x 100
Subtract the new number by the original number
734 - 870 = -136
-136 ÷ 870 = -0.15632183908045977
-0.15632183908045977 x 100 = -15.63%