2.42% is the change from 620 to 635
Calculation steps:
[( 635 - 620 ) ÷ 620] x 100 = 2.42%
Formula
Percentage change = [(635 - 620) / 620] x 100
Subtract the new number by the original number
635 - 620 = 15
15 ÷ 620 = 0.024193548387096774
0.024193548387096774 x 100 = 2.42%