71.3% is the change from 345 to 591
Calculation steps:
[( 591 - 345 ) ÷ 345] x 100 = 71.3%
Formula
Percentage change = [(591 - 345) / 345] x 100
Subtract the new number by the original number
591 - 345 = 246
246 ÷ 345 = 0.7130434782608696
0.7130434782608696 x 100 = 71.3%