6.72% is the change from 521 to 556
Calculation steps:
[( 556 - 521 ) ÷ 521] x 100 = 6.72%
Formula
Percentage change = [(556 - 521) / 521] x 100
Subtract the new number by the original number
556 - 521 = 35
35 ÷ 521 = 0.0671785028790787
0.0671785028790787 x 100 = 6.72%