1.64% is the change from 611 to 621
Calculation steps:
[( 621 - 611 ) ÷ 611] x 100 = 1.64%
Formula
Percentage change = [(621 - 611) / 611] x 100
Subtract the new number by the original number
621 - 611 = 10
10 ÷ 611 = 0.016366612111292964
0.016366612111292964 x 100 = 1.64%