9.64% is the change from 581 to 637
Calculation steps:
[( 637 - 581 ) ÷ 581] x 100 = 9.64%
Formula
Percentage change = [(637 - 581) / 581] x 100
Subtract the new number by the original number
637 - 581 = 56
56 ÷ 581 = 0.0963855421686747
0.0963855421686747 x 100 = 9.64%