2.3% is the change from 304 to 311
Calculation steps:
[( 311 - 304 ) ÷ 304] x 100 = 2.3%
Formula
Percentage change = [(311 - 304) / 304] x 100
Subtract the new number by the original number
311 - 304 = 7
7 ÷ 304 = 0.023026315789473683
0.023026315789473683 x 100 = 2.3%