3.19% is the change from 596 to 615
Calculation steps:
[( 615 - 596 ) ÷ 596] x 100 = 3.19%
Formula
Percentage change = [(615 - 596) / 596] x 100
Subtract the new number by the original number
615 - 596 = 19
19 ÷ 596 = 0.031879194630872486
0.031879194630872486 x 100 = 3.19%