-31.41% is the change from 831 to 570
Calculation steps:
[( 570 - 831 ) ÷ 831] x 100 = -31.41%
Formula
Percentage change = [(570 - 831) / 831] x 100
Subtract the new number by the original number
570 - 831 = -261
-261 ÷ 831 = -0.3140794223826715
-0.3140794223826715 x 100 = -31.41%