7.1% is the change from 620 to 664
Calculation steps:
[( 664 - 620 ) ÷ 620] x 100 = 7.1%
Formula
Percentage change = [(664 - 620) / 620] x 100
Subtract the new number by the original number
664 - 620 = 44
44 ÷ 620 = 0.07096774193548387
0.07096774193548387 x 100 = 7.1%