18.43% is the change from 521 to 617
Calculation steps:
[( 617 - 521 ) ÷ 521] x 100 = 18.43%
Formula
Percentage change = [(617 - 521) / 521] x 100
Subtract the new number by the original number
617 - 521 = 96
96 ÷ 521 = 0.18426103646833014
0.18426103646833014 x 100 = 18.43%