7.1% is the change from 521 to 558
Calculation steps:
[( 558 - 521 ) ÷ 521] x 100 = 7.1%
Formula
Percentage change = [(558 - 521) / 521] x 100
Subtract the new number by the original number
558 - 521 = 37
37 ÷ 521 = 0.0710172744721689
0.0710172744721689 x 100 = 7.1%