81.63% is the change from 343 to 623
Calculation steps:
[( 623 - 343 ) ÷ 343] x 100 = 81.63%
Formula
Percentage change = [(623 - 343) / 343] x 100
Subtract the new number by the original number
623 - 343 = 280
280 ÷ 343 = 0.8163265306122449
0.8163265306122449 x 100 = 81.63%