-31.29% is the change from 831 to 571
Calculation steps:
[( 571 - 831 ) ÷ 831] x 100 = -31.29%
Formula
Percentage change = [(571 - 831) / 831] x 100
Subtract the new number by the original number
571 - 831 = -260
-260 ÷ 831 = -0.3128760529482551
-0.3128760529482551 x 100 = -31.29%