3.85% is the change from 597 to 620
Calculation steps:
[( 620 - 597 ) ÷ 597] x 100 = 3.85%
Formula
Percentage change = [(620 - 597) / 597] x 100
Subtract the new number by the original number
620 - 597 = 23
23 ÷ 597 = 0.038525963149078725
0.038525963149078725 x 100 = 3.85%