2.38% is the change from 630 to 645
Calculation steps:
[( 645 - 630 ) ÷ 630] x 100 = 2.38%
Formula
Percentage change = [(645 - 630) / 630] x 100
Subtract the new number by the original number
645 - 630 = 15
15 ÷ 630 = 0.023809523809523808
0.023809523809523808 x 100 = 2.38%