3.71% is the change from 620 to 643
Calculation steps:
[( 643 - 620 ) ÷ 620] x 100 = 3.71%
Formula
Percentage change = [(643 - 620) / 620] x 100
Subtract the new number by the original number
643 - 620 = 23
23 ÷ 620 = 0.037096774193548385
0.037096774193548385 x 100 = 3.71%