-2.58% is the change from 581 to 566
Calculation steps:
[( 566 - 581 ) ÷ 581] x 100 = -2.58%
Formula
Percentage change = [(566 - 581) / 581] x 100
Subtract the new number by the original number
566 - 581 = -15
-15 ÷ 581 = -0.025817555938037865
-0.025817555938037865 x 100 = -2.58%