2.9% is the change from 310 to 319
Calculation steps:
[( 319 - 310 ) ÷ 310] x 100 = 2.9%
Formula
Percentage change = [(319 - 310) / 310] x 100
Subtract the new number by the original number
319 - 310 = 9
9 ÷ 310 = 0.02903225806451613
0.02903225806451613 x 100 = 2.9%