6.71% is the change from 581 to 620
Calculation steps:
[( 620 - 581 ) ÷ 581] x 100 = 6.71%
Formula
Percentage change = [(620 - 581) / 581] x 100
Subtract the new number by the original number
620 - 581 = 39
39 ÷ 581 = 0.06712564543889846
0.06712564543889846 x 100 = 6.71%