0.16% is the change from 620 to 621
Calculation steps:
[( 621 - 620 ) ÷ 620] x 100 = 0.16%
Formula
Percentage change = [(621 - 620) / 620] x 100
Subtract the new number by the original number
621 - 620 = 1
1 ÷ 620 = 0.0016129032258064516
0.0016129032258064516 x 100 = 0.16%