-34.37% is the change from 870 to 571
Calculation steps:
[( 571 - 870 ) ÷ 870] x 100 = -34.37%
Formula
Percentage change = [(571 - 870) / 870] x 100
Subtract the new number by the original number
571 - 870 = -299
-299 ÷ 870 = -0.34367816091954023
-0.34367816091954023 x 100 = -34.37%