13.44% is the change from 521 to 591
Calculation steps:
[( 591 - 521 ) ÷ 521] x 100 = 13.44%
Formula
Percentage change = [(591 - 521) / 521] x 100
Subtract the new number by the original number
591 - 521 = 70
70 ÷ 521 = 0.1343570057581574
0.1343570057581574 x 100 = 13.44%