2.3% is the change from 305 to 312
Calculation steps:
[( 312 - 305 ) ÷ 305] x 100 = 2.3%
Formula
Percentage change = [(312 - 305) / 305] x 100
Subtract the new number by the original number
312 - 305 = 7
7 ÷ 305 = 0.022950819672131147
0.022950819672131147 x 100 = 2.3%