81.05% is the change from 343 to 621
Calculation steps:
[( 621 - 343 ) ÷ 343] x 100 = 81.05%
Formula
Percentage change = [(621 - 343) / 343] x 100
Subtract the new number by the original number
621 - 343 = 278
278 ÷ 343 = 0.8104956268221575
0.8104956268221575 x 100 = 81.05%