31.1% is the change from 344 to 451
Calculation steps:
[( 451 - 344 ) ÷ 344] x 100 = 31.1%
Formula
Percentage change = [(451 - 344) / 344] x 100
Subtract the new number by the original number
451 - 344 = 107
107 ÷ 344 = 0.311046511627907
0.311046511627907 x 100 = 31.1%