31.49% is the change from 343 to 451
Calculation steps:
[( 451 - 343 ) ÷ 343] x 100 = 31.49%
Formula
Percentage change = [(451 - 343) / 343] x 100
Subtract the new number by the original number
451 - 343 = 108
108 ÷ 343 = 0.31486880466472306
0.31486880466472306 x 100 = 31.49%