-31.15% is the change from 870 to 599
Calculation steps:
[( 599 - 870 ) ÷ 870] x 100 = -31.15%
Formula
Percentage change = [(599 - 870) / 870] x 100
Subtract the new number by the original number
599 - 870 = -271
-271 ÷ 870 = -0.3114942528735632
-0.3114942528735632 x 100 = -31.15%