22.26% is the change from 521 to 637
Calculation steps:
[( 637 - 521 ) ÷ 521] x 100 = 22.26%
Formula
Percentage change = [(637 - 521) / 521] x 100
Subtract the new number by the original number
637 - 521 = 116
116 ÷ 521 = 0.22264875239923224
0.22264875239923224 x 100 = 22.26%