1.61% is the change from 620 to 630
Calculation steps:
[( 630 - 620 ) ÷ 620] x 100 = 1.61%
Formula
Percentage change = [(630 - 620) / 620] x 100
Subtract the new number by the original number
630 - 620 = 10
10 ÷ 620 = 0.016129032258064516
0.016129032258064516 x 100 = 1.61%