2.44% is the change from 615 to 630
Calculation steps:
[( 630 - 615 ) ÷ 615] x 100 = 2.44%
Formula
Percentage change = [(630 - 615) / 615] x 100
Subtract the new number by the original number
630 - 615 = 15
15 ÷ 615 = 0.024390243902439025
0.024390243902439025 x 100 = 2.44%