3.09% is the change from 615 to 634
Calculation steps:
[( 634 - 615 ) ÷ 615] x 100 = 3.09%
Formula
Percentage change = [(634 - 615) / 615] x 100
Subtract the new number by the original number
634 - 615 = 19
19 ÷ 615 = 0.030894308943089432
0.030894308943089432 x 100 = 3.09%