81.1% is the change from 344 to 623
Calculation steps:
[( 623 - 344 ) ÷ 344] x 100 = 81.1%
Formula
Percentage change = [(623 - 344) / 344] x 100
Subtract the new number by the original number
623 - 344 = 279
279 ÷ 344 = 0.811046511627907
0.811046511627907 x 100 = 81.1%