-30.57% is the change from 821 to 570
Calculation steps:
[( 570 - 821 ) ÷ 821] x 100 = -30.57%
Formula
Percentage change = [(570 - 821) / 821] x 100
Subtract the new number by the original number
570 - 821 = -251
-251 ÷ 821 = -0.30572472594397077
-0.30572472594397077 x 100 = -30.57%