-30.57% is the change from 831 to 577
Calculation steps:
[( 577 - 831 ) ÷ 831] x 100 = -30.57%
Formula
Percentage change = [(577 - 831) / 831] x 100
Subtract the new number by the original number
577 - 831 = -254
-254 ÷ 831 = -0.3056558363417569
-0.3056558363417569 x 100 = -30.57%