-8.6% is the change from 570 to 521
Calculation steps:
[( 521 - 570 ) ÷ 570] x 100 = -8.6%
Formula
Percentage change = [(521 - 570) / 570] x 100
Subtract the new number by the original number
521 - 570 = -49
-49 ÷ 570 = -0.08596491228070176
-0.08596491228070176 x 100 = -8.6%