-31.38% is the change from 870 to 597
Calculation steps:
[( 597 - 870 ) ÷ 870] x 100 = -31.38%
Formula
Percentage change = [(597 - 870) / 870] x 100
Subtract the new number by the original number
597 - 870 = -273
-273 ÷ 870 = -0.3137931034482759
-0.3137931034482759 x 100 = -31.38%