3.5% is the change from 571 to 591
Calculation steps:
[( 591 - 571 ) ÷ 571] x 100 = 3.5%
Formula
Percentage change = [(591 - 571) / 571] x 100
Subtract the new number by the original number
591 - 571 = 20
20 ÷ 571 = 0.03502626970227671
0.03502626970227671 x 100 = 3.5%