-30.34% is the change from 870 to 606
Calculation steps:
[( 606 - 870 ) ÷ 870] x 100 = -30.34%
Formula
Percentage change = [(606 - 870) / 870] x 100
Subtract the new number by the original number
606 - 870 = -264
-264 ÷ 870 = -0.30344827586206896
-0.30344827586206896 x 100 = -30.34%